Thermal and size effect on the R lines luminescence in YAG:Cr3+
Thermal and size effect on the R lines luminescence in YAG:Cr3+
复制标题
DOI：
10.1016/j.jlumin.2014.10.053
复制
发表时间：
2015-02
影响因子：
3.6
通讯作者：
M. Erdem;G. Özen;U. Yahsi;B. Bartolo
中科院分区：
文献类型：
--
作者：
M. Erdem;G. Özen;U. Yahsi;B. Bartolo
研究了Y_3Al_5O_（12）：Cr ~（3+）纳米粉末样品的R线发光的线宽和线位。对每个样品，我们都精确地测量了30 ~ 300 K的发射光谱.光谱通常由R线窄光谱发射和伴随的振动边带组成。从较大到较短的直径的粉末在每个温度下，我们注意到的R线发光的半最大值的宽度增加。当温度从30 K升高到300 K时，发射向低能方向移动。通过调整描述这些过程的公式中的电子-声子参数并使用体材料的相同德拜温度，可以解释不同样品中R线的温度依赖性加宽和位移。
We have studied the line positions and widths of R lines luminescence of nanopowder samples of Y3Al5O12: Cr3+particles with diameters ranging from about 28 to 250 nm. For each sample we have measured accurately the emission spectrum from 30 K to 300 K. The spectra generally consisted of the R-lines narrow spectral emission and of the accompanying vibronic side-bands. From larger to shorter diameters of powders at each temperature we noticed an increase of the width at half-maxima of the R lines luminescence. The emissions were shifted towards lower energies when increasing the temperature from 30 K to 300 K. The temperature dependent broadening and shift of the R lines in the different samples can be accounted for by adjusting the electron–phonon parameters in the formulas describing these processes and using the same Debye temperature of the bulk material.