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Luminescence spectroscopy of Cr3+ in an oxide: A strong or weak crystal-field phosphor?
Journal of Luminescence ( IF 3.3 ) Pub Date : 2021-02-10 , DOI: 10.1016/j.jlumin.2021.117965
Sadao Adachi

Various Cr3+-activated oxide phosphors can be classified into two groups: a strong crystal field group [E(2Eg)ZPL < E(4T2g)ZPL] and a weak crystal field group [E(2Eg)ZPL > E(4T2g)ZPL] from an equality relation of the zero-phonon line (ZPL) energies of 2Eg and 4T2g. Obtaining reliable Racah parameters for the 3d3 ion (Cr3+) usually needs accurate information on the three excited-state ZPL energies, E(2Eg)ZPL, E(4T2g)ZPL, and E(4T1g,a)ZPL. However, an exact determination of such ZPL energies is a very difficult problem. Because of an accumulation with adjacent excited states along with the presence of charge transfer band, this is especially for E(4T1g,a)ZPL. An importance of accurate determination of the excited-state energies to be used in the Racah parameter calculation is discussed in detail with demonstrating a risk of erroneous conclusion of whether Cr3+-activated oxide phosphor belongs to a strong or weak crystal-field phosphor.



中文翻译:

氧化物中Cr 3+的发光光谱:强或弱晶场磷光体?

各种Cr 3+活化的氧化物磷光体可分为两类:强晶场组[ E2 E gZPL  <  E4 T 2 gZPL ]和弱晶场组[ E2 E gZPL  >  E4 T 2 gZPL ]从零声子线(ZPL)能量2 E g4 T 2 g的等式。获得3 d 3离子(Cr 3+)的可靠Racah参数通常需要有关三种激发态ZPL能量E2 E gZPLE4 T 2 gZPLE4 T 1,aZPL。但是,准确确定这种ZPL能量是一个非常困难的问题。由于具有相邻激发态的累积以及电荷转移带的存在,这尤其对于E4T 1 g,aZPL。详细讨论了精确确定要在Racah参数计算中使用的激发态能量的重要性,并证明了错误结论Cr 3+活化的氧化物磷光体属于强场还是弱晶场磷光体。

更新日期:2021-02-18
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