Abstract Se doped ZnO nanorods prepared by mechanothermal method with generation of multiple zinc (VZn), oxygen (VO) vacancies and oxygen interstitials (Oi) defects induce multicolor emissions by single and two-photon single wavelength excitations. The photoluminescence spectrum under single-photon excitation exhibits a broad multicolor emission peak from 400 to 800 nm with λmax at ~625 nm and a large Stokes shift of about 250 nm due to overlapping of defects in electronic transitions. The de-convolution peaks within superposition of defects (VZn, VO and Oi) induce multicolor broadband emission to show blue, green and red emissions that are consistent with their corresponding defects. The EPR signals also reveal detail information about these defects and show correlation with optical electronic transition states of blue, green and red emissions in Se doped ZnO NRs. Moreover, the two-photon up-conversion luminescence of Se doped ZnO NRs also shows multicolor (blue, green and red) emissions from channel at 720 nm excitation. Two-photon confocal studies of Se doped ZnO NRs shows multicolor emission at 720, 800 and 860 nm excitations which are consistent with one photon fluorescence at 360, 400 and 430 nm excitations. Therefore, these defects induced multicolor emissions by one and two-photon excitation wavelengths have potential optoelectronic and biomedical applications.

中文翻译：

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通过单波长激发缺陷在 Se 掺杂的 ZnO 纳米棒中诱导多色下转换和上转换荧光

摘要 通过机械热法制备的 Se 掺杂 ZnO 纳米棒产生多个锌 (VZn)、氧 (VO) 空位和氧间隙 (Oi) 缺陷，通过单光子和双光子单波长激发诱导多色发射。单光子激发下的光致发光光谱表现出从 400 到 800 nm 的宽多色发射峰，λmax 在~625 nm 处，由于电子跃迁中的缺陷重叠，斯托克斯位移约为 250 nm。缺陷（VZn、VO 和 Oi）叠加内的去卷积峰诱导多色宽带发射，以显示与其相应缺陷一致的蓝色、绿色和红色发射。EPR 信号还揭示了有关这些缺陷的详细信息，并显示了与蓝色光学电子跃迁态的相关性，Se 掺杂的 ZnO NRs 中的绿色和红色发射。此外，Se 掺杂的 ZnO NRs 的双光子上转换发光也显示出在 720 nm 激发下来自通道的多色（蓝色、绿色和红色）发射。Se 掺杂的 ZnO NRs 的双光子共焦研究显示，在 720、800 和 860 nm 激发下的多色发射与在 360、400 和 430 nm 激发下的单光子荧光一致。因此，这些缺陷由一光子和二光子激发波长引起的多色发射具有潜在的光电和生物医学应用。800 和 860 nm 激发与在 360、400 和 430 nm 激发下的单光子荧光一致。因此，这些缺陷由一光子和二光子激发波长引起的多色发射具有潜在的光电和生物医学应用。800 和 860 nm 激发与在 360、400 和 430 nm 激发下的单光子荧光一致。因此，这些缺陷由一光子和二光子激发波长引起的多色发射具有潜在的光电和生物医学应用。