期刊
ACS APPLIED ELECTRONIC MATERIALS
卷 3, 期 3, 页码 1403-1412出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaelm.1c00012
关键词
red phosphors; Eu3+ phosphors; quantum yield; silicate phosphors; temperature sensitivity
资金
- Introduced Innovative RAMP
- D Team Project of The Pearl River Talent Recruitment Program of Guangdong Province [2019ZT08C321]
- SSL Innovation Model Factory Project [Y9D1011L211]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515110443]
- National Nature Science Foundation of China [51872327]
Eu3+-activated Gd4.67Si3O13 rare-earth silicate phosphor has been developed with high photoluminescence quantum yields exceeding 80%, comparable to commercial rare-earth nitride red phosphors. This phosphor can be excited by near-ultraviolet or blue light and emits red light at a dominant wavelength of 615 nm, making it suitable for warm white LED applications. Additionally, it exhibits good thermal cycling stability and has potential applications in optical temperature measurement systems with a maximum relative sensitivity of 1.05 x 10(-2) K-1 at 456 K.
Eu3+-activated oxide components appear as a kind of rare-earth red phosphors that can be used for warm white light-emitting diode (LEDs). At present, it is still a challenge to synthesize oxide-component phosphors with high photoluminescence quantum yields compared to those of nitride and fluoride red phosphors. Herein, we propose a kind of Eu3+-activated Gd4.67Si3O13 rare-earth silicate phosphor by the convenient high-temperature solid reaction method. These designed phosphors can be effectively excited by either 394 nm near-ultraviolet light or 465 nm blue light and then emit red light at a dominant wavelength of 615 nm. Particularly, for the optimal Eu3+-concentration-activated Gd3.67EuSi3O13 phosphor, photoluminescence quantum yields are measured to be above 80%, which is superior to that of the general rare-earth oxide salt phosphor and comparable to that of commercial rare-earth nitride red phosphors such as Ca-alpha-SiAlON:Eu2+ (QY = 70.5%) and CaAlSiN3:Ce3+ (QY = 80%). Packaged with commercial yellow phosphor Ce3+:YAG and UV or blue LED chip, our red component serves to improve the CRI and CCT for the tunable white light-emitting devices. Moreover, the phosphor has good thermal cycling stability with a thermal-quenching activation energy of 0.28912 eV. Finally, the temperature-dependent properties make the Gd4.67Si3O13:Eu3+ phosphors have potential application in optical temperature measurement systems. The maximum relative sensitivity S-r is found to be 1.05 x 10(-2) K-1 at 456 K.
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