1. Tunable blue-green color emitting Al5O6N: Eu2+, Tb3+ phosphors with energy transfer for near-UV white LEDs.
- Author
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Dong, Quan, Cui, Jun, Tian, Yabin, Yang, Fengli, Ming, Hong, Du, Fu, Peng, Jiaqing, and Ye, Xinyu
- Subjects
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ENERGY transfer , *PHOSPHORS , *THERMOLUMINESCENCE , *HEAT transfer , *THRESHOLD energy , *THERMAL stability - Abstract
A series of tunable blue-green emitting phosphors Al 5 O 6 N: Eu2+, Tb3+ were prepared via gas-pressure sintering reaction process. The morphology, UV–Vis reflectance spectra, photoluminescence properties, decay behavior, Eu2+ occupy site, energy transfer mechanism and thermal stability were investigated systematically. The Al 5 O 6 N: 0.003Eu2+, 0.01Tb3+ phosphor exhibits strong green emission under near-UV excitation due to briskly efficient energy transfer from Eu2+ to Tb3+. The maximum energy transfer efficiency calculated by decay lifetime can reach 80%. The mechanism of energy transfer from the Eu2+ to Tb3+ is considered to be a dipole−dipole type. The critical distance of the energy transfer is calculated via the concentration quenching method. Moreover, the color emission from blue to green can be obtained through controlling the concentration of Eu2+ and Tb3+. These results reveal the potential value of Al 5 O 6 N: Eu2+, Tb3+ phosphors as green light emitting material for near-UV pumped white light-emitting diodes. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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