White-Light Emission of Amine-Functionalized Organic/Inorganic Hybrids: Emitting Centers and Recombination Mechanisms
作者： LD Carlos , RA Sá Ferreira , RN Pereira , M Assunção , V de Zea Bermudez
DOI: 10.1021/JP049052R
关键词: Spontaneous emission 、 Metal 、 Recombination 、 Triethoxysilane 、 Siloxane 、 Photoluminescence 、 Electron paramagnetic resonance 、 Nanoclusters 、 Photochemistry 、 Chemistry
摘要: This work discusses the recombination mechanisms and chemical nature of emitting centers subjacent to white-light emission sol−gel derived amine-functionalized hybrids lacking metal activator ions, such as those based on 3-aminopropyl)triethoxysilane (APTES), 3-glycidyloxypropyltrimethoxysilane (GPTES), urea urethane precursors. The photoluminescence (PL) results from a convolution originated in NH (NH2) groups or bridges (APTES- GPTES-based hybrids) with electron−hole recombinations occurring siloxane nanoclusters. These two components reveal radiative mechanism typical donor−acceptor pairs, mediated by some localized centers. Photoinduced proton-transfer between defects NH3+ NH- (GPTES- APTES-based NH2+ N- (di-ureasils di-urethanesils) is proposed responsible for NH-related component. Electron paramagnetic resonance data suggest that sp...
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