Full-color phosphors from amine-functionalized crosslinked hybrids lacking metal activator ions
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
27/05/2014
27/05/2014
01/04/2001
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Resumo |
Sol-gel derived hybrids that contain OCH2CH2 (polyethylene glycol, PEG) repeat units grafted onto a siliceous backbone by urea, -NHC(=O)NH-, or urethane, -NHC(=O)O-, bridges have been prepared. It is demonstrated that the white light PL of these materials results from an unusual convolution of a longer lived emission that originates in the NH groups of the urea/urethane bridges with shorter lived electron-hole recombinations occurring in the nanometer-sized siliceous domains. The PL efficiencies reported here (maximum quantum yields at room temperature of ≈ 0.20 ± 0.02 at a 400 nm excitation wavelength) are in the same range as those for tetramethoxysilane-formic acid, and APTES-acetic acid, sol-gel derived phosphors. The high quantum yields combined with the possibility of tuning the emission to colors across the chromaticity diagram present a wide range of potential applications for these hybrid materials. |
Formato |
111-115 |
Identificador |
http://dx.doi.org/10.1002/1616-3028(200104)11:2<111::AID-ADFM111>3.0.CO;2-V Advanced Funtional Materials, v. 11, n. 2, p. 111-115, 2001. 1616-301X http://hdl.handle.net/11449/66482 10.1002/1616-3028(200104)11:2<111::AID-ADFM111>3.0.CO;2-V WOS:000169587200004 2-s2.0-0035314399 |
Idioma(s) |
eng |
Relação |
Advanced Funtional Materials |
Direitos |
closedAccess |
Palavras-Chave | #Amines #Crosslinking #Electrons #Grafting (chemical) #Molecular weight #Organic acids #Photoluminescence #Polyethylene glycols #Quantum theory #Sol-gels #Urea #Chromaticity #Electron-hole recombination #Formic acid #Quantum yield #Tetramethoxysilane #Urethane #Phosphors |
Tipo |
info:eu-repo/semantics/article |