...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Optical Materials >Photoluminescence of InP nanocrystals embedded in silica gel-glasses as a function of temperature, and excitation power
【24h】

Photoluminescence of InP nanocrystals embedded in silica gel-glasses as a function of temperature, and excitation power

机译：嵌入到硅胶玻璃中的InP纳米晶体的光致发光与温度和激发功率的关系

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

InP nanocrystals embedded in silica glasses were prepared by combining the sol-gel process and the heat treatment in H_2 gas. The size of InP nanocrystals was found to be from 2 to 8 nm in diameter by transmission electron microscopy. A strong photoluminescence (PL) with peaks at 605, 735 and 856 nm was observed from 3InP/100SiO_3 nanocompositions at 77 K. The temperature- and excitation power-dependent PL spectra from the nanocomposition are measured in order to confirm the origin of the PL spectra. The behaviors of the three peaks emissions suggest that 605, 735, and 856 nm emissions do not have the same origin. The PL peak centered at 856 nm may arise from 8 nm InP nanocrystals with 5-10% size distribution instead of all the InP nanocrystals with different sizes embedded in the SiO_2 gel-glasses. The 605 and 735 nm emissions may arise from oxygen related defect centers in the SiO_2 gel-glass matrix and at the interface between the InP crystallite core and SiO_2 glass matrix. The quenching of PL from the InP nanocrystals with diameters < 8 nm may be quenched due to the pressure-induced Γ-X transition. The result provides an evidence for the prediction of Fu and Zunger.
机译：通过结合溶胶-凝胶法和在H_2气体中的热处理，制备了嵌入石英玻璃的InP纳米晶体。通过透射电子显微镜发现InP纳米晶体的尺寸为直径2至8nm。从3InP / 100SiO_3纳米复合材料在77 K处观察到了在605、735和856 nm处具有峰值的强光致发光（PL）。测量了纳米组合物与温度和激发功率有关的PL光谱，以确认PL的起源光谱。三个峰值发射的行为表明605、735和856 nm发射的来源不同。以856nm为中心的PL峰可能来自具有5-10％尺寸分布的8nm InP纳米晶体，而不是嵌在SiO_2凝胶玻璃中的所有具有不同尺寸的InP纳米晶体。 605和735 nm的发射可能来自SiO_2凝胶玻璃基质中以及InP微晶核与SiO_2玻璃基质之间的界面上与氧有关的缺陷中心。直径<8 nm的InP纳米晶体对PL的猝灭可能由于压力诱导的Γ-X跃迁而猝灭。该结果为Fu和Zunger的预测提供了依据。

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