136 resultados para BAFBR-EU2


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Sm2 + Eu2 + Tm2 + Yb2 + ,SrB4 O7SrB6 O10 BaB8O13 , , , ,

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CaY1 -xBO4xEu ,Eu3+CaYBO4Eu3+ , ,Y ;Eu O ,Eu3+ ,Eu O ;Eu3+ (x >0 1 0 ) ,Eu3+Ca2 + ,Eu3+Eu2 +

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Eu3+ Tb3+ , , ,Eu3+ Eu2 + ,Eu3+ Tb3+ Eu2 + CaBPO5 Eu ,Tb2 5 4 3 65nmCe3+ ,Ce3+ Eu2 + ,Tb3+ Ce3+

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Eu2 + ,Eu2 + :KCaF3BaY2 F8 ,Eu2 + ,Eu2 + ,Eu2 + (F- ) , ,Eu2 + (O2 - ) ;KCaF3 ,H2 ,Eu2 + (O2 - ) ;BaY2 F8 ,H2 ,Eu2 + (O2 - ) ,H2 ,Eu2 + (O2 - )

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KMgF3 doped with Eu was synthesized by mild hydrothermal method at 240 degreesC for the first time. The excitation and emission spectra of the KMgF3 : Eu2+ phosphor were measured. Comparing with the sample synthesized through solid state reaction, the variation in the excitation spectra at 360 nm resulted from the existences of V-K color centers; the low emission intensity was due to Eu2+ having transferred part energy to V-K color centers.

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When CaS:Sm3+, Eu2+ is excited at 476.5 nm (Ar+), the emission spectra taken at room temperature and at 77 K are different, indicating that there are two competitive energy transfer processes-Sm3+ --> Eu2+ and Eu2+ --> Sm3+ with phonon participation. So, the luminescence intensity of Sm3+ increases first, and then decreases as the concentration of Eu2+ is increasing. (C) 2001 Elsevier Science Ltd. All rights reserved.

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Ba Y2 F8 Ce3 + ,Ba Y2 F8 Eu2 + Ba Y2 F8 Ce,Eu, . Ba Y2 F8 Ce F3 Eu F3 Ce3 + Eu2 + Ce3 + Eu3 + . , Ce4 +

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77K , Eu2 + Eu2 + Ce3+ KMg F3 . KMg F3 Eu-Ce Eu2 + 6P5/ 2 Ce3+ 4 f 5 d ,

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Eu2 + Eu,X( X=Ce,Cr,Gd,Cu) KMg F3 30 0 K 77K , Eu2 + , . Eu2 +

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The reduction of RE3+ to RE2+ (RE=Eu, Sm and Tm) in SrB6O10 prepared in air by high-temperature solid state reaction was observed. The luminescent properties of Eu2+ and Tm2+ show f-d transition and Sm2+ shows f-f transition at room temperature. Three crystallographic sites for Sm2+ in matrix are available. Vibronic transition of D-5(0)-F-7(0) of Sm2+ was studied. The coupled phonon energy about 108 cm(-1), was determined: from the vibronic transition. Due to the thermal population from D-5(0) level, (D1-FJ)-D-5-F-7 (J=0, 1, 2) transitions of Sm2+ were observed at room temperature. A charge compensation mechanism is proposed as a possible explanation.

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MAl2O4 Eu2+RE3+(M=Mg,Ca,Sr,Ba;RE=Y,La,Ce,Pr,Nd,Sm,Gd,Tb,Dy,Ho,Er,Tm,Yb,Lu).Eu2+4f-5d.Re3+,.RE3+,MAl2O4 Eu2+RE3+RE3+.,,X-,,,

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Eu2+MMgAl10O17M0.10nm-Al2O3Eu2+Ca2+-Al2O3Mg2+Al3+Eu2+dfEu3+-Al2O3Eu2+-Al2O3Mg2+Al3+Eu2+dfffEu3+-Al2O3Eu2+ffEu3+-Al2O3-Al2O3Eu2+ffdf

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KZnF3Ce3+Eu2+Ce3+Eu2+Ce3+Eu2+Ce3+Eu2+f-f.

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EuEu2+

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BaMgAl10O17:Eu2BuMgAl10O17Eu2,Eu2.