New red-emitting phosphor of Eu3+-doped Ba2Gd0.67W1−xMoxO6 for solid state lighting
Yitong Jiang A , Wenhao Liu A , Jie Liu
A * and Xibin Yu A *
+ Author Affiliations
- Author Affiliations
A The Education Ministry Key Laboratory of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, College of Chemistry and Materials Science, Shanghai Normal University, Shanghai 200234, China.
Australian Journal of Chemistry 75(6) 412-421 https://doi.org/10.1071/CH22025
Submitted: 1 February 2022 Accepted: 30 May 2022 Published: 15 July 2022
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing.
Abstract
In recent years, white light emitting diodes (LEDs) as a typical green lighting source have attracted great attention. A promising red phosphor for LEDs, (Ba0.8Eu0.1Li0.1)2Gd0.67W1 − xMoxO6 solid solution, was synthesized by a high-temperature solid-state reaction. The excitation spectra of phosphors can be broadened by substituting Mo for W, which has good absorption in the near ultraviolet region. We measured the X-ray diffraction, absorption spectra, excitation spectra and emission spectra of these solid solutions, and analyzed their crystal structures. This series of phosphors present a relatively effective excitation band in the near-UV region (370–425 nm) from the charge transfer state of MoO6 and orange-red luminescence at 596 nm from the 5D0 → 7F1 transition. With increasing molybdate content, the luminescence intensity of (Ba0.8Eu0.1Li0.1)2Gd0.67W1−xMoxO6 (x = 0.15–0.6), increases first and then decreases, and reaches a maximum at x = 0.4. The red phosphor excited by near ultraviolet light provides a reference value for white LEDs.
Keywords: double perovskite, Eu3+, light conversion, luminescence property, molybdate, red phosphor, tungstate, white light-emitting diode.
References
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