White-Emitting Phosphor Ca2BO3Cl : Ce3 + , Eu2 + for UV Light-Emitting Diodes
White-Emitting Phosphor Ca2BO3Cl : Ce3 + , Eu2 + for UV Light-Emitting Diodes
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DOI：
10.1149/1.3106039
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发表时间：
2009-06
影响因子：
3.9
通讯作者：
Chongfeng Guo;L. Luan;F. Shi;X. Ding
中科院分区：
文献类型：
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作者：
Chongfeng Guo;L. Luan;F. Shi;X. Ding
Ce 3+和Eu 2+共激活的Ca 2BO 3Cl荧光粉在紫外光激发下呈现出蓝色和黄色两个发光带。不对称的蓝光发射来自Ce 3+，而黄光发射来自Eu 2+。用Ce 3+与Eu 2+的共振型能量转移解释了发光机理，并通过发光相对强度的衰减和增长计算了能量转移效率。根据能量传递原理，通过适当调节Ce 3+ /Eu 2+的比例，可以实现荧光粉从蓝色到白色再到黄色的不同发光颜色。
Ce 3+ and Eu 2+ coactivated Ca 2 BO 3 Cl phosphors exhibit two blue and yellow emission bands under the excitation of UV light. An asymmetric blue emission originates from Ce 3+ , whereas the yellow emission originates from Eu 2+ . The luminescent mechanism is explained by the resonance-type energy transfer from Ce 3+ to Eu 2+ , and the energy-transfer efficiency is also calculated by decline and growth of their emission relative intensities. In light of the principle of energy transfer, the varied emitted color of phosphor from blue through white and finally to yellow can be achieved by properly tuning the ratio of Ce 3+ /Eu 2+ .