Journal
JOURNAL OF RARE EARTHS
Volume 39, Issue 7, Pages 749-756Publisher
ELSEVIER
DOI: 10.1016/j.jre.2020.07.006
Keywords
Luminescence; Tantalate; Ca2YTaO6:Eu3+; Light-emitting diodes; Rare earths
Categories
Funding
- Northwest A&F University, China [201910712069]
- Hunan Provincial Key Laboratory of Xiangnan RarePrecious Metals Compounds and Applications [2019XGJSKFJJ01]
- Construction Program of the key discipline in Hunan Province
- Projects of the Education Department of Hunan Province [18A465]
- Science and Technology Plan Project of Chenzhou City [jsyf2017014]
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A novel red-emitting phosphor tantalate Ca2YTaO6:Eu3+ was synthesized with high color purity and thermal stability, showing potential applications in white light-emitting diodes (w-LEDs).
A novel red-emitting phosphor tantalate Ca2YTaO6:Eu3+ was synthesized by a solid-state reaction. The purity and surface morphology of the phosphors were characterized. The Ca2YTaO6:Eu3+ phosphors show a sharp emission peak at 612 nm under near-ultraviolet (n-UV) at 395 nm because of the D-5(0) -> F-7(2) transition of Eu3+. The optimal Eu3+ doping concentration in Ca2YTaO6 is 40 mol% and the critical energy-transfer distance of Eu3+ ions was calculated to be 0.9 nm. The emission spectra of Ca2YTaO6:Eu3+ from 300 to 480 K were investigated. The thermal-quenching temperature (T-0.5) of Ca2YTaO6:Eu3+ is above 480 K. The color purity of Ca2YTaO6:40 mol%Eu3+ is as high as 99.8%. The luminescence lifetime of Ca2YTaO6:40 mol%Eu3+ was also discussed. The high color purity and high thermal stability of Eu3+-doped Ca2YTaO6 phosphors contribute to its application value in white light-emitting diodes (w-LEDs). (C) 2020 Published by Elsevier B.V. on behalf of Chinese Society of Rare Earths.
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