Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (9): 2717.doi: 10.7503/cjcu20210380

• Inorganic Chemistry • Previous Articles     Next Articles

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)

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

CLC Number: 

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