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Effects of doping \(\hbox {Pr}^{3+}\) and \(\hbox {Gd}^{3+}\) into YAG:Ce phosphors on the luminescence properties

  • Shihong TongEmail author
Article
  • 28 Downloads

Abstract

A series of \((\hbox {Y}_{0.98-x-y}\hbox {Ce}_{0.02}\hbox {Pr}_{x}\hbox {Gd}_{y})_{3}\hbox {Al}_{5}\hbox {O}_{12}\) (\(x=0{-}0.02\), \(y=0,\,0.3\)) phosphors were prepared by a modified co-precipitation method. The phases, luminescence properties, effect of calcination temperature on luminescence properties and energy transfer (ET) were investigated. The results indicated that the doping of \(\hbox {Pr}^{3+}\) and \(\hbox {Gd}^{3+}\) in all samples did not produce any new phases but caused a slight lattice expansion. The series of (\(\hbox {Y}_{0.98-x}\hbox {Ce}_{0.02}\hbox {Pr}_{x})_{3}\hbox {Al}_{5}\hbox {O}_{12}\) phosphors emit additional red light at 612 nm, and when \(x=0.005\), the red/yellow ratio of the emission spectrum is the largest. Compared with the (\(\hbox {Y}_{0.975}\hbox {Ce}_{0.02}\hbox {Pr}_{0.005})_{3}\hbox {Al}_{5}\hbox {O}_{12}\) phosphor, continued doping 30 at% \(\hbox {Gd}^{3+}\) in the (\(\hbox {Y}_{0.675}\hbox {Ce}_{0.02}\hbox {Pr}_{0.005}\hbox {Gd}_{0.3})_{3}\hbox {Al}_{5}\hbox {O}_{12}\) sample makes the peak wavelength of yellow light emission shift from 533 to 561 nm. Doping \(\hbox {Pr}^{3+}\) and \(\hbox {Gd}^{3+}\) results in the decrease of integrated emission intensity, but the emission intensity and the red/yellow ratio can be increased by raising the calcination temperature. In addition, there is only the ET from \(\hbox {Ce}^{3+}\) to \(\hbox {Pr}^{3+}\) in the (\(\hbox {Y}_{0.675}\hbox {Ce}_{0.02}\hbox {Pr}_{0.005}\hbox {Gd}_{0.3})_{3}\hbox {Al}_{5}\hbox {O}_{12}\) sample.

Keywords

Co-precipitation YAG:Ce phosphor white-light LED energy transfer 

Notes

Acknowledgements

This research is supported by the Technology Fund of Sichuan Provincial Education Department under Grant 16ZA0059.

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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  1. 1.College of Sciences of Southwest Petroleum UniversityChengduPeople’s Republic of China

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