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ESR在ACEL ZnS:Mn,Cu和ZnS:Cu材料研究中的应用 总被引:1,自引:1,他引:0
ZnS:Mn,Cu粉末发光材料的ESR谱随Mn2+浓度和制备条件的不同有着明显的变化。根据耦合Mn2+的ESR谱理论分析,计算ESR谱参数及其饱和现象表明,当Mn2+浓度>0.2%,Mn2+开始形成离子团,Mn2+团的形成和Mn2+离子与晶格间耦合随Mn2+浓度的增大而增强是发光浓度猝灭的主要原因,Mn2+浓度约为0.7%具有最高发光亮度。本文还讨论了退火条件对ZnS:Mn,Cu ESR谱的影响以及老化的ZnS:Cu中Cu2+的ESR谱。 相似文献
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This tutorial focuses on devices and technologies that are part of laser-based visible light communication(VLC)systems. Laser-based VLC systems have advantages over their light-emitting-diode-based counterparts, including having high transmission speed and long transmission distance. We summarize terminologies related to laser-based solid-state lighting and VLC, and further review the advances in device design and performance.The high-speed modulation characteristics of laser diodes and superluminescent diodes and the on-chip integration of optoelectronic components in the visible color regime, such as the high-speed integrated photodetector,are introduced. The modulation technology for laser-based white light communication systems and the challenges for future development are then discussed. 相似文献
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Mn~(2+)浓度C(0.5%,0.6%)相同,而煅烧温度不同的DCEL ZnS:Mn、Cu粉未样品的EPR谱是不同的.用微机模拟EPR谱,计算出Mn~(2+)团所占Mn~(2+)的比例Cc/C.煅烧温度低于950℃时,Mn~(2+)团比例随锻烧温度升高而减少,煅烧温度高于950℃时,六角晶相比例和Mn~(2+)团比例同时随锻烧温度的升高而增加.分析表明,六角晶相有利于Mn~(2+)间的间接电子自旋交换作用,在相同的掺Mn、Cu浓度条件下,对比立方晶相,它将使更多的Mn~(2+)形成团,使材料的发光亮度降低.文中还讨论了锻烧DCEL ZnS:Mn、Cu材料的最佳温度问题. 相似文献
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