高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (9): 2717.doi: 10.7503/cjcu20210380

• 无机化学 • 上一篇    下一篇

基于能量传递可调光色荧光粉Ca2LaTaO6∶ Dy3+, Sm3+的发光性质及其发光二极管器件应用

袁博1(), 祁超超1, 张相挺2, 栾国颜1, 邹海峰2()   

  1. 1.吉林化工学院石油化工学院, 吉林 132022
    2.吉林大学化学学院, 长春 130012
  • 收稿日期:2021-06-03 出版日期:2021-09-10 发布日期:2021-09-08
  • 通讯作者: 袁博,邹海峰 E-mail:yb19880613@163.com;haifengzou0431@sohu.com
  • 基金资助:
    吉林化工学院校级重大项目(2016009);吉林化工学院博士启动基金(2017001)

Luminescence Property and LED Device Application for Color-tunable Ca2LaTaO6∶Dy3+,Sm3+ Phosphor Based on Energy Transfer

YUAN Bo1(), QI Chaochao1, ZHANG Xiangting2, LUAN Guoyan1, ZOU Haifeng2()   

  1. 1.College of Petrochemical Engineering,Jilin Chemical Engineering University,Jilin 132022,China
    2.College of Chemistry,Jilin University,Changchun 130012,China
  • Received:2021-06-03 Online:2021-09-10 Published:2021-09-08
  • Contact: YUAN Bo,ZOU Haifeng E-mail:yb19880613@163.com;haifengzou0431@sohu.com
  • Supported by:
    the Major Program for the Field of Jilin Institute of Chemical Technology, China(2016009);the PhD Start-Up Funding of Jilin Institute of Chemical Technology, China(2017001)

摘要:

通过固相反应法设计了Dy3+, Sm3+共掺杂双钙钛矿结构Ca2LaTaO6(CLTO)光色可调的白光发光二极管(LED)荧光粉. 通过Rietveld精修计算, 确定了Ca2LaTaO6的晶体结构参数和Dy3+, Sm3+离子的晶格占位, 并用密度泛函理论(DFT)计算了禁带宽度. 激发/发射光谱和荧光衰减行为证实了共掺杂体系中Dy3+到Sm3+的能量传递. Dy3+→Sm3+的能量传递机制为电偶极-电偶极相互作用, 离子间的临界距离为1.176 nm. 基于Dy3+→Sm3+的能量传递, 可通过调节Dy3+/Sm3+离子的掺杂浓度比, 使发光颜色从黄色转变为黄红色, 并实现白光发射. 利用该荧光粉与紫外芯片结合制作成白光发光二极管器件, 并确定了这些LED器件的发光效率、 CIE色度坐标、 相关色温(CCT)和显色指数(CRI)等. 结果表明, 这些荧光粉在紫外激发的白光LED中具有潜在的应用价值.

关键词: Ca2LaTaO6, 能量传递, 色点调谐, 发光二极管器件

Abstract:

A series of Dy3+, Sm3+ co-doped double perovskite Ca2LaTaO6 (CLTO) white light emitting diodes(WLED) phosphors with tunable color was designed by solid state reaction method. The crystal structure parameters of Ca2LaTaO6 and the lattice occupation for Dy3+, Sm3+ ions in the host were determined through Rietveld refinement, and the band gap was calculated by density functional theory(DFT). Meanwhile, the energy migration from Dy3+ to Sm3+was confirmed by the aids of emission/excitation spectra and luminescent decay measurements. The mechanism of energy transfer was explored to be the resonant type via a dipole-dipole interaction and the critical distances between Dy3+ and Sm3+ were calculated to be 1.176 nm. Based on the energy transfer for Dy3+→Sm3+, by tuning the molarity ratio of doping Dy3+/Sm3+ ions, multicolor emission from yellow to yellow-red and white light shall be achieved in Ca2LaTaO6∶Dy3+, Sm3+ phosphors. Finally, white light-emitting diode prototypes were fabricated using as-prepared phosphors and UV chips, the luminescence efficiency, CIE chromaticity coordinates, correlated color temperature(CCT) and color rendering index (CRI) of the LED prototype were exhibited. The results indicated that these phosphors had potential application in UV white LED.

Key words: Ca2LaTaO6, Energy transfer, Color point tuning, LED device

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