J4 ›› 2015, Vol. 32 ›› Issue (5): 519-524.

• 光谱 • 上一篇    下一篇

纳米发光材料电荷迁移激发光谱的红移机理研究

卜树坡 尚春宇   

  1. 1苏州工业职业技术学院 电子与通信工程系,江苏 苏州 215104; 
    2.黑龙江科技大学电子与信息工程学院,黑龙江 哈尔滨 150027
  • 收稿日期:2014-12-19 修回日期:2015-01-08 出版日期:2015-09-28 发布日期:2015-09-28
  • 通讯作者: 卜树坡(1963—)高级工程师,主要研究方向为控制工程技术/新型发光材料。 E-mail:bushupo@163.com
  • 基金资助:

    中国博士后科学基金 (2012M510899)

Theoretical investigation on the red shift of charge transfer excitation spectrum for nano-sized phosphors

Bu Shupo, Shang Chunyu   

  1. 1 Department of Electronic and Communication Engineering, Suzhou Institute of Industrial Technology, Suzhou 215104, China;
    2 School of Electronic and Information Engineering, Heilongjiang University of science and technology, Haerbin150027, China
  • Received:2014-12-19 Revised:2015-01-08 Published:2015-09-28 Online:2015-09-28

摘要:

基于Kronig-Penney模型,得出了晶体材料禁带宽度 或特定能级 在禁带中的位置随着晶体体积畸变而变化的趋势,进而推断出Y2O3:Eu3+发光材料的零声子电荷迁移能 将随着材料纳米尺寸的下降而下降。此外,Y2O3:Eu3+纳米发光材料晶格环境刚性的下降导致了发光中心CT态坐标偏差的增大,这意味着在电荷迁移(CT)激发中发光中心将跃迁至更高的振动能级。随着Y2O3:Eu3+发光材料纳米尺寸的下降,振动能 的上升幅度小于零声子电荷迁移能 的下降幅度,电荷迁移能ECT由此下降,CT激发光谱向低能端移动。

关键词: 纳米材料, 红移机理, Kronig-Penney模型, Y2O3:Eu3+发光材料, 电荷迁移激发

Abstract:

Based on Kronig-Penney model, the changing tendency of band gap or a particular level with the volume deformation in crystalline materials has been derived. On the basis of this changing tendency, the zero-phonon CT energy is deduced to be decreased when the size of Y2O3:Eu3+ phosphor decreases in nano-scale. In addition, the rigidity decrease of lattice environment in Y2O3:Eu3+ nano-phosphor leads to the enlargement of CTS coordinate offset, an optical center would reach a higher vibration level in CT excitation. The increasing magnitude in is smaller than the decreasing magnitude of when the size of Y2O3:Eu3+ phosphor decreases in nano-scale. As a result, the CT energy is decreased, and the CT excitation spectrum shifts to lower energy.

Key words: nano-sized materials, red-shift mechanism, Kronig-Penney model, Y2O3:Eu3+ phosphor, CT excitation