MECHANISM OF EMISSION COLOR SHIFT WITH ACTIVATOR CONCENTRATION IN EU+3 ACTIVATED PHOSPHORS
MECHANISM OF EMISSION COLOR SHIFT WITH ACTIVATOR CONCENTRATION IN EU+3 ACTIVATED PHOSPHORS
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DOI：
10.1149/1.2407810
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发表时间：
1971-01-01
影响因子：
3.9
通讯作者：
JAFFE, PM
中科院分区：
文献类型：
--
作者：
OZAWA, L;JAFFE, PM
Eu ~（3+）激活的荧光粉的发射通常由三个激发态产生，即：_,（蓝绿色），5D 1在荧光体温度保持恒定的情况下，作为活化剂浓度的函数的发射颜色偏移是由于~ D2，~ D1，~ D为Eu ~（3+）光谱中的发射。然而，人们只了解5D 0发射的浓度猝灭机制。5D 0发射强度取决于分离的单个活化剂离子的浓度，其又取决于主体的晶体结构和活化剂（7）的摩尔分数。对于弱吸收的直接光激发，每个激活剂离子的5Dn发射强度遵循以下方程：
The emission of Eu+ 3 activated phosphors usually results from three excited states, namely'D. _,(bluegreen), 5D1 (green-orange), 5D0 (red) and the emission color shifts from yellow to red with an increase in activator concentration (1-3) and/or in the phosphor temperature (4-6).In the case where the phosphor temperature is held constant, the emission color shift as a function of activator concentration is due to the difference in concentration dependence curves of the~ D2,~ D1, and~ D, emissions in the Eu+ 3 spectrum. However, only the concentration quenching mechanism of the 5D0 emission is understood. The 5D0 emission intensity depends on the concentration of isolated single activator ions which in turn depend on the crystal structure of the host and the mole fraction of activator (7). For weakly absorbed direct photoexcitation, the 5Dn emission intensity per activator ion follows the equation