期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 48, 页码 41479-41486出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b13759
关键词
Eu3+-doped phosphor; Ba6Gd2Ti4O17 host; nonconcentration quenching; energy migration; light-emitting diodes
资金
- National Natural Science Foundation of China (NSFC)-Yunnan and Guangdong Provinces [U1702254, U1301242]
- NSFC [21771195]
- Research Fund for the Doctoral Program of Higher Education of China (RFDP) [20130171130001]
- Natural Science Foundation of Guangdong Province [2016A030313305]
- Special Fund of Guangdong Province Project for Applied Science and Technology Research and Development [2017B090917001, 2016B090931007, 2015B090927002]
- Science and Technology Planning Project of Guangzhou City [201604016005, 201607010360]
Energy migration (energy transfer among identical luminescence centers) is always thought to be related to the concentration quenching in luminescence materials. However, the novel Eu3+-doped Ba6Gd2Ti4O17 phosphor seems to be an exception. In the series of Ba6Gd2(1-x)Ti4O17:xEu(3+) (x = 0.1, 0.3, 0.5, 0.7, and 0.9) phosphors prepared and investigated, no concentration quenching is found. Detailed investigations of the crystal structure and the luminescence properties of Ba6Gd2(1-x)Ti4O17:xEu(3+) reveal that the nonoccurrence of concentration quenching is related to the dimensional restriction of energy migration inside the crystal lattices. In Ba6Gd2Ti4O17, directly increasing the number of Eu3+ ions to absorb as much excitation energy as possible allows to achieve a higher brightness. The highly Eu3+-doped Ba6Gd2(1-x)Ti4O17:xEu(3+) (x = 0.9) sample can convert near-UV excitation into red light, whose Commission Internationale de l'Eclairage (CIE) coordinates are (0.64, 0.36) and the color purity can reach up to 94.4%. Moreover, warm white light with the CIE chromaticity coordinates of (0.39, 0.39), the correlated color temperature of 3756 K, and the color rendering index of 82.2 is successfully generated by fabricating this highly Eu3+-doped phosphor in a near-UV light-emitting diode chip together with the green YGAB:Tb3+ and blue BAM:Eu2+ phosphors.
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