The influence of post-annealing on optical properties of Eu-doped ZnO (ZnO:Eu³⁺) microsphere synthesized by hydrothermal method has been studied. The intrinsic deep defect emission of ZnO and the transition emission of both ⁵D₀→⁷F₁ and ⁵D₀→⁷F₂ related to Eu³⁺ have been observed under excitation at 325 nm. The photoluminescence (PL) spectra reveal that ZnO annealed in N₂ is more favorable for Eu³⁺ being doped into ZnO, which is helpful to greatly enhance the red light emission of ZnO:Eu³⁺. Alkaline conditions are more conducive to the formation of intrinsic deep defects in ZnO lattice, but they are not so conducive to the doping of Eu³⁺ ions into ZnO lattice. From Gaussian deconvolution analysis of PL spectrum for ZnO:Eu³⁺, it can be seen that intrinsic defects of ZnO in N₂ atmosphere may efficiently assist energy transfer from ZnO host to Eu³⁺ ions to enhance Eu³⁺ intrinsic red light emission. There are blue light (446 nm), green light (525 nm) and stronger red light (618 nm) which are simultaneously obtained. This work could pave a way for high performance of white light emission application.

研究了后退火对水热法合成的Eu掺杂ZnO（ZnO：Eu ³⁺）微球光学性能的影响。在325 nm激发下，观察到ZnO的本征深缺陷发射以及与Eu ³⁺有关的⁵ D ₀ → ⁷ F ₁和⁵ D ₀ → ⁷ F ₂的跃迁发射。光致发光（PL）光谱表明，在N _2中退火的ZnO更有利于Eu ³⁺掺杂到ZnO中，这有助于大大增强ZnO：Eu ³⁺的红色发光。。碱性条件更有利于在ZnO晶格中形成固有的深层缺陷，但不利于将Eu ³⁺离子掺杂到ZnO晶格中。从ZnO：Eu ³⁺的PL光谱的高斯去卷积分析可以看出，N ₂气氛中ZnO的固有缺陷可以有效地帮助能量从ZnO主体转移到Eu ³⁺离子，从而增强Eu ³⁺固有的红光发射。同时获得了蓝光（446 nm），绿光（525 nm）和较强的红光（618 nm）。这项工作可以为高性能的白光发射应用铺平道路。