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Photoluminescence study on defects in pristine anatase and anatase-based composites

机译:原始锐钛矿和基于锐钛矿的复合材料中的缺陷的光致发光研究

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Under 325 nm laser light irradiation at room temperature in oxygen gas, the photoluminescence (PL) intensity of pristine anatase TiO2 decreases considerably and then it recovers reversibly with the same laser light irradiation at room temperature in vacuum. This result gives important information on the oxygen defects at anatase particle surfaces and may also clarify the origin of largely Stokes shifted broad PL band in pristine anatase. New reversible photoinduced spectral change has been also found in anatase-AgI composites for replacing atmosphere (vacuum<---->oxygen gas) under 325 nm laser light irradiation at room temperature. This spectral change may arise from the excitation energy transfer between excitons in AgI domain and photoinduced oxygen defects at the anatase particle surfaces. (C) 2003 Elsevier B.V. All rights reserved. [References: 8]
机译:在氧气在室温下于325 nm激光照射下,原始锐钛矿型TiO2的光致发光(PL)强度显着降低,然后在真空下与室温下相同的激光照射可逆地恢复。该结果提供了有关锐钛矿颗粒表面氧缺陷的重要信息,也可能阐明了原始锐钛矿中大量斯托克斯位移的宽PL带的起源。在锐钛矿-AgI复合材料中还发现了新的可逆的光诱导光谱变化,该复合材料用于在室温下在325nm激光照射下代替大气(真空氧气)。这种光谱变化可能源于AgI域激子与锐钛矿颗粒表面的光致氧缺陷之间的激发能转移。 (C)2003 Elsevier B.V.保留所有权利。 [参考:8]

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