295 resultados para anomalous Eu3 5D0->F-7(0) transition
em Chinese Academy of Sciences Institutional Repositories Grid Portal
Resumo:
Electroluminescence (EL) devices with Eu(HTH)(3)phen [HTH: 4,4,5,5,6,6,6-heptafluoro-1-(2-thienyl)-1,3-hexanedione, phen: I 10-phenanthroline] as an emissive centre were fabricated using vacuum evaporation. In addition to the Eu3+ 5D0 --> F-7(J) (J = 0-4) lines that were visible in the photoluminescence signal, the device also showed strong emission from the D-5(1) --> F-7(J) (J = 0-4) transitions. The enhanced emission from the D-5(1) F-7(J) (J = 0-4) transitions was attributed to the increased excitation intensity in the EL device. The luminescence lifetimes of the 5 D, and 5 Do levels were measured to be 0.6 mus and 866 mus, respectively.
Resumo:
<h3><img src="http://cover1.chaoxing.com//cover/Cover2.dll?iid=656563666a6a63646a6ba09b3037393038383534" border="0" alt="" hspace="6" width="150" height="213" align="left" /></h3><div class="partOrAll"><div class="abut_top part"> </div></div><div class="abut"></div><div class="abut_top partOrAlls"><p><a href="http://book.chaoxing.com/ebook/read_11266067_1.html" target="_blank"> </a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_1.html" target="_blank"></a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_1.html" target="_blank">1</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_1.html" target="_blank">1</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_2.html" target="_blank">1.1</a></p><div class="allContent" style="display: block"><p><a href="http://book.chaoxing.com/ebook/read_11266067_6.html" target="_blank">1.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_10.html" target="_blank">1.3</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_13.html" target="_blank">1.4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_17.html" target="_blank">1.5</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_21.html" target="_blank">2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_21.html" target="_blank">2.1</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_29.html" target="_blank">2.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_35.html" target="_blank">2.3</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_45.html" target="_blank">2.4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_61.html" target="_blank">2.5 </a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_65.html" target="_blank">2.6</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_75.html" target="_blank">2.7</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_79.html" target="_blank">2.8</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_85.html" target="_blank">3</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_85.html" target="_blank">3.1</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_89.html" target="_blank">3.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_94.html" target="_blank">3.3</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_103.html" target="_blank">3.4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_115.html" target="_blank">4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_115.html" target="_blank">4.1 </a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_128.html" target="_blank">4.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_140.html" target="_blank">4.3</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_148.html" target="_blank">4.4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_155.html" target="_blank">4.5</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_164.html" target="_blank">4.6</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_173.html" target="_blank">4.7</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_189.html" target="_blank">4.8</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_205.html" target="_blank">4.9</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_214.html" target="_blank">5</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_214.html" target="_blank">5.1</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_224.html" target="_blank">5.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_230.html" target="_blank">5.3</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_234.html" target="_blank">5.4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_239.html" target="_blank">6</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_239.html" target="_blank">6.1</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_250.html" target="_blank">6.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_262.html" target="_blank">6.3</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_267.html" target="_blank">6.4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_276.html" target="_blank">6.5</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_282.html" target="_blank">6.6</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_291.html" target="_blank">6.7</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_300.html" target="_blank">7</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_300.html" target="_blank">7.1</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_304.html" target="_blank">7.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_310.html" target="_blank">7.3</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_314.html" target="_blank">7.4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_318.html" target="_blank">7.5</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_325.html" target="_blank">8</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_325.html" target="_blank">8.1</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_335.html" target="_blank">8.2 </a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_339.html" target="_blank">8.3</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_345.html" target="_blank">8.4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_351.html" target="_blank">8.5</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_358.html" target="_blank">9</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_358.html" target="_blank">9.1 </a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_364.html" target="_blank">9.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_370.html" target="_blank">9.3</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_378.html" target="_blank">9.4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_382.html" target="_blank">9.5</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_388.html" target="_blank">9.6</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_392.html" target="_blank">9.7</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_397.html" target="_blank">9.8</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_405.html" target="_blank">1 0</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_405.html" target="_blank">10.1 </a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_410.html" target="_blank">10.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_416.html" target="_blank">10.3 </a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_422.html" target="_blank">10.4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_425.html" target="_blank">10.5</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_434.html" target="_blank">1 1</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_434.html" target="_blank">11.1</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_435.html" target="_blank">11.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_436.html" target="_blank">11.3 ANSYS</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_436.html" target="_blank">11.4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_447.html" target="_blank">11.5</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_454.html" target="_blank">12</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_454.html" target="_blank">12.1 </a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_466.html" target="_blank">12.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_485.html" target="_blank">2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_485.html" target="_blank">13APDL</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_485.html" target="_blank">13.1 K</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_485.html" target="_blank">13.1.1 K</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_486.html" target="_blank">13.1.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_486.html" target="_blank">13.1.3</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_486.html" target="_blank">13.2APDL</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_487.html" target="_blank">13.2.1</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_487.html" target="_blank">13.2.2 ANSYS </a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_488.html" target="_blank">13.2.3</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_490.html" target="_blank">13.3UIDL</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_490.html" target="_blank">13.3.1 </a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_490.html" target="_blank">13.3.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_491.html" target="_blank">13.4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_491.html" target="_blank">13.4.1</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_491.html" target="_blank">13.4.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_493.html" target="_blank">13.4.3</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_494.html" target="_blank">13.4.4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_494.html" target="_blank">13.4.5</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_495.html" target="_blank">13.4.6</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_495.html" target="_blank">13.4.7</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_496.html" target="_blank">13.4.8</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_499.html" target="_blank">13.5</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_499.html" target="_blank">13.5.1</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_499.html" target="_blank">13.5.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_501.html" target="_blank">13.5.3</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_501.html" target="_blank">13.6</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_501.html" target="_blank">13.6.1</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_501.html" target="_blank">13.6.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_502.html" target="_blank">13.6.3</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_502.html" target="_blank">13.6.4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_503.html" target="_blank">14</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_503.html" target="_blank">14.1</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_503.html" target="_blank">14.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_505.html" target="_blank">14.3</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_506.html" target="_blank">14.3.1</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_506.html" target="_blank">14.3.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_506.html" target="_blank">14.3.3</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_506.html" target="_blank">14.3.4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_507.html" target="_blank">14.3.5 4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_507.html" target="_blank">14.4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_507.html" target="_blank">14.4.1</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_508.html" target="_blank">14.4.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_508.html" target="_blank">14.4.3</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_509.html" target="_blank">14.4.4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_510.html" target="_blank">14.5</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_516.html" target="_blank">14.6</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_519.html" target="_blank">14.7</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_536.html" target="_blank">15</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_536.html" target="_blank">15.1</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_536.html" target="_blank">15.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_537.html" target="_blank">15.3SHELL51</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_537.html" target="_blank">15.3.1</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_539.html" target="_blank">15.3.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_542.html" target="_blank">15.3.3</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_544.html" target="_blank">15.3.4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_546.html" target="_blank">15.3.5</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_546.html" target="_blank">15.3.6</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_550.html" target="_blank">15.482DPLANE82</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_551.html" target="_blank">15.4.1</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_551.html" target="_blank">15.4.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_558.html" target="_blank">15.4.3</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_559.html" target="_blank">15.4.4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_560.html" target="_blank">15.5203Dsolid951/4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_560.html" target="_blank">15.5.11/4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_561.html" target="_blank">15.5.2</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_567.html" target="_blank">15.5.3</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_570.html" target="_blank">15.5.4</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_571.html" target="_blank">15.5.5</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_573.html" target="_blank"></a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_573.html" target="_blank">A</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_606.html" target="_blank">B</a></p><p><a href="http://book.chaoxing.com/ebook/read_11266067_647.html" target="_blank"></a></p></div></div>
Resumo:
The foil-excited the spectrum of highly stripped titanium ions between 12-40 nm has been studied. Titanium ions of 80 and 120 MeV were provided by the HI-13 tandem accelerator at the China Institute of Atomic Energy. GIM-957 XUV-VUV monochromator was refocused to get highly-resolved spectra. Our experimental results and the published spectral data of laser-produced plasma show agreement in nearly all cases within +/- 0.03 nm. The spectra contained some weak or strong lines previously unclassified. These spectral lines mainly belong to 2s2p(2) for TiXVIII, 2p(3) for TiXVIII, 2s2p(3) for TiXVII, 2p(6)4p for Ti XII and 2p(6)3d for Ti XII transitions.
Resumo:
The luminescence properties of silica gels and silica gels doped with two rare earth complexes, Eu(TTA)(3) and Tb(o-CBA)(3) (TTA=thenoyltriffuocetate, o-CBA=o-chlorobenzoic acid) are reported and discussed. Pure silica gels show a blue luminescence, and the maximum excitation and emission wavelengths depend strongly on the solvents used. Both of the studied rare earth complexes exhibit the characteristic emissions of the rare earth ions in silica gels, i.e., Eu3+5D0-->F-7(J)(J=0,1,2,3,4), Tb3+5D4-->F-7(J)(J=3,4,5,6) transitions. Compared with the pure RE-complexes powder, the silica gels doped with RE-complexes show fewer emission lines of the rare earth ions. Furthermore the rare earth ion (Tb3+) presents a longer lifetime (1346 mu s) in silica gel doped with Tb(o-CBA)3 than in pure Tb((o-CBA)(3) powder (744 mu s). The reasons responsible for these results are discussed in the context.
Resumo:
Pechini Y2O3Eu3+,,560mY2O3Eu3+X(XRD) (FT IR)(AFM),(PL)XRD500,900,(50%)Y2O3Eu3+,Eu3+5D0 7FJ(J=0,1,2,3,4),
Resumo:
The reduction process from trivalent to divalent state for Sm3+ and Yb3+ ions in barium berates (BaB8O13) prepared in air was observed. The luminescence properties of these divalent rare-earth ions were studied. Yb2+ shows an f-d broad emission band, due to the 4f(14) --> 4f(13)5d transition, while the Sm2+ ion shows an f --> f transition. From the spectra of Yb2+, and using the D-5(0) --> F-7(0) transition of Sm2+ as a structural probe, two crystallographic sites were found to be available for the cations in the host. Vibronic transitions of Sm2+ were observed at low temperature. BaB8O13 was found to be a good host for reducing the trivalent rare-earth ions to divalent state and to exhibit interesting spectroscopic properties,
Resumo:
The valence change of samarium from trivalent to divalent state in strontium berates (SrB6O10) prepared in air was observed. The high resolution spectra of Sm2+ in matrix were studied between 10 K and 300 K. The results showed that three crystallographic sites for Sm2+ were available in the host. Energy transfer among these sites was possible. The vibronic transition of D-5(0) --> F-7(0) of Sm2+ was studied at room temperature and the Huang-Rhys factor S was calculated. Due to the thermal population, D-5(1) --> F-7(0) transition at room temperature was observed.
Resumo:
The luminescence of Sm2+ in BaB8O13 are studied as a function of temperature. At 10 K, several crystallographic sites for Sm2+ ions with inversion symmetry are possible and D-5(0) --> F-7(1) transition show predominant intensities, whereas above 50 K two crystallographic sites without inversion symmetry are clearly observed for Sm2+ in BaB8O13 and the D-5(0) --> F-7(0) transition show strongest intensity. The vibronic transitions and the non-radiative transitions of Sm2+ are studied and a coupled-phonon energy about 50 cm(-1) is obtained. The thermal effects on the line shift, emission intensities, half-width and lifetime of the D-5(0) --> F-7(0) transition are also studied. The decay curves at different temperatures are all in single exponential and are temperature-independent with lifetime around 3.5 ms. (C) 1999 Elsevier Science B.V. All rights reserved.
Resumo:
The valence change of samarium from trivalent to divalent in strontium hexaborate (SrB6O10) prepared in air is observed. The temperature dependence of the luminescence and vibronic transitions of Sm2+ are studied. The Sm2+ ions occupy three crystallographic sites. With increasing temperature, the D-5(0)-->F-7(0) transition line exhibits red shifts, and the half-width increases. At room temperature, due to the thermal population through the 4f(5)5d channel, the D-5(1)-->F-7(J) transitions are observed even though the vibrational energy is very close to the energy gap between the D-5(1) and D-5(0) levels in the host. A coupled phonon energy of about 108 cm(-1) is determined from the vibronic transitions of Sm2+ in the host.
Resumo:
By using an Ar+ ion laser, a tunable Rh 6G dye laser(Linewidth : 0.5 cm(-1)) and a Coherent 899-21 dye laser as light sources and using a monochromator and a phase-locking amplifier, the optical properties of Eu3+ : Y2SiO5 crystal were detected. Persistent spectral hole burning (PSHB) were also observed in (5)Do-(7)Fo transition in the crystal at the temperature of 16 K. For 15 mW dye laser (Wavelength : 579.62 nm) burning the crystal for 0.1 s a spectral hole with about 80 MHz hole width were detected and the hole can been keep for longer than 10 h.
Resumo:
Uniform Gd(OH)(3) nanotubes have been prepared via a simple wet-chemical route at ambient pressure and low temperature, without any catalysts, templates, or substrates, in which Gd(NO3)(3) was used as the gallium source and ammonia as the alkali. SEM and TEM images indicate that the as-obtained Gd(OH)3 entirely consists of uniform nanotubes in high yield with diameters of about 40 nm and lengths of 200-300 nm. The temperature-dependent morphological evolution and the formation mechanism of the Gd(OH)(3) nanotubes were investigated in detail. Furthermore, the Gd2O3 and Eu3+-doped Gd2O3 nanotubes, which inherit their parents' morphology, were obtained during a direct annealing process in air. The corresponding Gd2O3:Eu3+ nanotubes exhibit the strong red emission corresponding to the D-5(0)-F-7(2), transition of the Eu3+ ions under UV light or low-voltage electron beam excitation, which might find potential applications in the fields such as light-emitting phosphors, advanced flat panel displays, or biological labeling.
Resumo:
Uniform Lu2O3:Eu3+ nanorods and nanowires have been successfully prepared through a simple solution-based hydrothermal process followed by a subsequent calcination process without using any surfactant, catalyst, or template. On the basis of X-ray diffraction, thermogravimetric analysis and differential scanning calorimetry, and Fourier transform infrared spectroscopy results, it can be assumed that the as-obtained precursors have the structure formula of Lu4O(OH)(9)(NO3), which is a new phase and has not been reported. The morphology of the precursors could be modulated from nanorods to nanowires with the increase of pH value using ammonia solution. The as-formed precursors could transform to cubic Lu2O3:Eu3+ with the same morphology and a slight shrinkage in size after an annealing process, Both the Lu2O3:Eu3+ nanorods and nanowires exhibit the strong red emission corresponding to the D-5(0)-F-7(2) transition of the Eu3+ ions under UV light excitation or low-voltage electron beam excitation.
Resumo:
Y2O3 : Eu3+ microspheres, with an average diameter of 3 mu m, were successfully prepared through a large-scale and facile solvothermal method followed by a subsequent heat treatment. X-ray diffraction, Fourier transform infrared spectroscopy, energy-dispersive X-ray spectra, thermogravimetric and differential thermal analysis, inductive coupled plasma atomic absorption spectrometric analysis, scanning electron microscopy, transmission electron microscopy, photoluminescence spectra, as well kinetic decays, and cathodoluminescence spectra were used to characterize the samples. These microspheres were actually composed of randomly aggregated nanoparticles. The formation mechanisms for the Y2O3 : Eu3+ microspheres have been proposed on an isotropic growth mechanism. The Y2O3 : Eu3+ microspheres show a strong red emission corresponding to D-5(0) -> F-7(2) transition (610 nm) of Eu3+ under ultraviolet excitation (259 nm) and low-voltage electron beams excitation (1-5 kV), which have potential applications in fluorescent lamps and field emission displays.
