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Defect emissions in ZnO nanostructures2

机译：ZnO纳米结构中的缺陷排放2

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摘要

Defects in three different types of ZnO nanostructures before and after annealing under different conditions were studied. The annealing atmosphere and temperature were found to strongly affect the yellow and orange-red defect emissions, while green emission was not significantly affected by annealing. The defect emissions exhibited a strong dependence on the temperature and excitation wavelength, with some defect emissions observable only at low temperatures and for certain excitation wavelengths. The yellow emission in samples prepared by a hydrothermal method is likely due to the presence of OH groups, instead of the commonly assumed interstitial oxygen defect. The green and orange-red emissions are likely due to donor acceptor transitions involving defect complexes, which likely include zinc vacancy complexes in the case of orange-red emissions.
机译：研究了在不同条件下退火前后三种不同类型的ZnO纳米结构的缺陷。发现退火气氛和温度强烈影响黄色和橙红色缺陷的发射，而绿色发射不受退火的显着影响。缺陷发射表现出对温度和激发波长的强烈依赖性，某些缺陷发射仅在低温和某些激发波长下才能观察到。通过水热法制备的样品中的黄色发射很可能是由于存在OH基团，而不是通常认为的间隙氧缺陷。绿色和橘红色排放可能是由于涉及缺陷配合物的供体受体过渡造成的，在橘红色排放的情况下，可能包括锌空位配合物。

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