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Titolo:
Full-color phosphors from amine-functionalized crosslinked hybrids lackingmetal activator ions
Autore:
Carlos, LD; Ferreira, RAS; Bermudez, VD; Ribeiro, SJL;
Indirizzi:
Univ Aveiro, Dept Fis, P-3810193 Aveiro, Portugal Univ Aveiro Aveiro Portugal P-3810193 pt Fis, P-3810193 Aveiro, Portugal UNESP, Inst Quim, BR-14800900 Araraquara, SP, Brazil UNESP Araraquara SP Brazil BR-14800900 BC-14800900 Araraquara, SP, Brazil Univ Tras Os Montes & Alto Duoro, Dept Quim, P-5001911 Vila Real, PortugalUniv Tras Os Montes & Alto Duoro Vila Real Portugal P-5001911 , Portugal
Titolo Testata:
ADVANCED FUNCTIONAL MATERIALS
fascicolo: 2, volume: 11, anno: 2001,
pagine: 111 - 115
SICI:
1616-301X(200104)11:2<111:FPFACH>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
ORGANICALLY MODIFIED SILICATES; SILICON NANOCRYSTALS; CONJUGATED POLYMERS; LIGHT EMISSION; PHOTOLUMINESCENCE; (3-AMINOPROPYL)TRIETHOXYSILANE; XEROGELS; EU3+;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
--discip_EC--
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Carlos, LD Univ Aveiro, Dept Fis, P-3810193 Aveiro, Portugal Univ Aveiro Aveiro Portugal P-3810193 810193 Aveiro, Portugal
Citazione:
L.D. Carlos et al., "Full-color phosphors from amine-functionalized crosslinked hybrids lackingmetal activator ions", ADV FUNCT M, 11(2), 2001, pp. 111-115

Abstract

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 approximate to 0.20 +/- 0.02 at a 400nm 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.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/11/17 alle ore 03:39:09