A novel pale‐yellow Ba2ZnGe2O7:Bi3+ phosphor with site‐selected excitation and small thermal quenching

A novel pale‐yellow Ba2ZnGe2O7:Bi3+ phosphor with site‐selected excitation and small thermal quenching was synthesized by conventional solid‐state sintering. The crystal structure and luminescence properties have been investigated in detail for the first time using XRD patterns, photoluminescence sp...

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Bibliographic Details
Published inJournal of the American Ceramic Society Vol. 102; no. 10; pp. 6068 - 6076
Main Authors Wu, Quansheng, Chen, Xi, Chen, Hande, Zhang, Hanqiang, Zhou, Jiangcong
Format Journal Article
LanguageEnglish
Published Columbus Wiley Subscription Services, Inc 01.10.2019
Subjects
Ba2ZnGe2O7:Bi3
Crystal structure
Crystallography
Emission spectra
Excitation spectra
LED
Luminescence
Optical properties
Organic light emitting diodes
pale‐yellow phosphor
Phosphors
Photoluminescence
Quenching
site‐selected excitations
Temperature dependence
White light
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Summary:A novel pale‐yellow Ba2ZnGe2O7:Bi3+ phosphor with site‐selected excitation and small thermal quenching was synthesized by conventional solid‐state sintering. The crystal structure and luminescence properties have been investigated in detail for the first time using XRD patterns, photoluminescence spectra, diffuse reflection spectra, decay curves, and temperature‐dependent emission spectra. The results reveal that the excitation spectrum of Ba2ZnGe2O7:Bi3+ phosphor locates in the near‐ultraviolet region of 300‐400 nm, and its emission shows an obvious site‐selective excitation phenomenon since Bi3+ ions occupy two different crystallographic sites in the Ba2ZnGe2O7 host. When excited under 360 nm, the phosphors show a pale‐yellow emission in the range of 400‐700 nm with the maximum peaking at 520 nm, while when excited under 316 nm, the phosphors show a blue emission in the range of 400‐700 nm with the maximum peaking at 480 nm. In addition, the emission of Ba2ZnGe2O7:Bi3+ can also be easily controlled by changing the Bi3+ concentration. The Ba2ZnGe2O7:Bi3+ phosphor has small thermal quenching, and its emission intensity only decreases by 2% at 200°C. The results indicate that this novel pale‐yellow Ba2ZnGe2O7:Bi3+ phosphor could be conducive to the development of white light‐emitting diodes.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.16477