• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Tuning of luminescence properties by controlling an aid-sintering additive and composition in Na(Ba/Sr/Ca)PO4:Eu2+ for white LEDs
【24h】

Tuning of luminescence properties by controlling an aid-sintering additive and composition in Na(Ba/Sr/Ca)PO4:Eu2+ for white LEDs

机译：通过控制用于白色LED的Na（Ba / Sr / Ca）PO 4 ：Eu 2 + 中的助烧结添加剂和组成来调节发光性能

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A series of Na(Ba/Sr/Ca)PO4:Eu2+ phosphors were prepared via a high-temperature solid-state reaction method. When the phase of NaCaPO4:Eu2+ was pure, the luminescence of Eu2+ was enhanced by doping the sintering-aid additive NaCl (t), and it showed a maxima at t = 0.03. For NaCaPO4:Eu2+ with 0.03NaCl, the XRD patterns, and emission and decay spectra demonstrated that Eu2+ ions occupied two different Ca sites with different coordination (i.e., eight and seven coordination). Therefore, two green emission bands at 510 and 542 nm were observed, and the emission band ranging from 480 to 510 nm had a weaker intensity. To obtain a cyan-broad emission, Ba2+ or Sr2+ were introduced into NaCaPO4:0.01Eu2+. The substitution of small Ca2+ ions by large Ba2+ or Sr2+ ions induced a decreased crystal field splitting of Eu2+ ions, which resulted in various full width at half maximum and a blue shift. The colors varied from green (0.1996, 0.4380) to blue (0.1578, 0.0978) under the same excitation. Overall, the phosphor has promising applications for use in white LEDs.
机译：制备了一系列Na（Ba / Sr / Ca）PO 4 ：Eu 2 + 荧光粉。 >通过高温固态反应方法。当NaCaPO 4 ：Eu 2 + 的相纯时，Eu t ）增强了> 2 + 值，在 t = 0.03时显示出最大值。对于具有0.03NaCl的NaCaPO 4 ：Eu 2 + ，XRD图谱以及发射和衰变光谱表明： Eu 2 + 离子占据两个不同的Ca位点，且具有不同的配位（即，八个和七个配位）。因此，在510和542nm处观察到两个绿色发射带，并且在480至510nm范围内的发射带具有较弱的强度。为了获得蓝绿色广泛的发射，将Ba 2 + 或Sr 2 + 引入NaCaPO 4 ：0.01Eu 2 + 。小Ca 2 + 离子被大Ba 2 + 或Sr 2取代+ 离子导致Eu 2 + 离子的晶体分裂减小，从而导致半峰全宽和蓝移。在相同的激发下，颜色从绿色（0.1996，0.4380）变为蓝色（0.1578，0.0978）。总体而言，磷光体在白光LED中具有广阔的应用前景。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号