Predicting and Modeling the Low‐Voltage Cathodoluminescent Efficiency of Oxide Phosphors
Predicting and Modeling the Low‐Voltage Cathodoluminescent Efficiency of Oxide Phosphors
复制标题
氧化物荧光粉的低压阴极发光效率的预测和建模
DOI：
10.1149/1.1838781
复制
发表时间：
1998
影响因子：
3.9
通讯作者：
M. Phillips
中科院分区：
文献类型：
--
作者：
L. Shea;J. McKittrick;M. Phillips
采用一种新的陶瓷合成技术--燃烧合成法制备了亚微米级的Y{sub 2}O{sub 3}：Eu{sup 3+}荧光粉。该技术利用硝酸钇和硝酸铕（氧化剂）与尿素（CH{sub 4}N{sub 2}O）燃料（还原剂）的放热氧化还原反应。所得粉末在合成状态下是发光的。然而，它们的发光强度随着反应后退火处理（1000 - 1600 ℃，2小时）的增加而增加。发现Y{sub 2}O{sub 3}：Eu{sup 3+}的低压（200- 1000 V）阴极发光效率随晶粒尺寸的增大而增大，与颗粒尺寸无关。低电压阴极发光模型，包括微晶尺寸的影响，辐射复合的概率，和表面束缚电子的影响，开发预测在低电压下的荧光粉效率。模型预测的效率与实验结果吻合得很好。
A novel ceramic synthesis technique, combustion synthesis, was used to produce submicron-sized Y{sub 2}O{sub 3}:Eu{sup 3+} phosphors. This technique exploits the exothermic redox reaction of yttrium and europium nitrates (oxidizers) with urea (CH{sub 4}N{sub 2}O) fuel (reducing agent). Resulting powders were luminescent in the as-synthesized state. However, their luminous intensity increased with increasing postreaction annealing treatments (1,000--1,600 C for 2 h). The low-voltage (200--1,000 V) cathodoluminescence efficiency of Y{sub 2}O{sub 3}:Eu{sup 3+} was found to increase with increasing crystallite size, independent of the particle size. A model of low-voltage cathodoluminescence that includes the effects of the crystallite size, the probability of radiative recombination, and the effect of surface-bound electrons was developed to predict phosphor efficiency at low voltages. The efficiencies predicted by the model are in very good agreement with experimental results.