荧光粉
光致发光
发光
八面体
拉曼光谱
兴奋剂
离子
斯托克斯位移
化学
谱线
Crystal(编程语言)
杂质
晶体结构
材料科学
分析化学(期刊)
结晶学
光学
光电子学
物理
色谱法
有机化学
计算机科学
程序设计语言
天文
作者
Weiwei Zhang,Junying Zhang,Ziyu Chen,Tianmin Wang,Shukai Zheng
标识
DOI:10.1016/j.jlumin.2010.04.002
摘要
Low-temperature photoluminescent spectra of ZnGa2O4:Cr3+ nano-sized phosphors calcined at different temperatures were reported. The fine structure of the emission spectra has been designated to Cr3+ ions in different sites including ideal octahedral, Zn-interstitial, GaZN4‐ZnGa6 sites and Ga2O3 impurity. The vibronic sidebands for both Stokes’ and anti-Stokes’ sides are related to the host lattice vibrations, which were confirmed by IR and Raman spectra. Al3+ is substituted in Ga3+ sites to form Zn(Ga1−yAly)2O4:Cr0.013+ (0≤y≤0.5). The blue shift and luminescent intensity variations of the charge transfer band and 3d–3d transitions in the spectra caused by Al substitution were related to larger band gap and stronger crystal field, respectively. The calculated crystal-field parameters indicated that Al incorporation enhanced the crystal field strength and induced more trigonal distortion due to different radii of Al3+ and Ga3+.
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