Tunable blue-green color emitting Al5O6N: Eu2+, Tb3+ phosphors with energy transfer for near-UV white LEDs

A series of tunable blue-green emitting phosphors Al5O6N: 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 investigate...

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Bibliographic Details
Published in:Journal of luminescence 2019-08, Vol.212, p.146-153
Main Authors: Dong, Quan, Cui, Jun, Tian, Yabin, Yang, Fengli, Ming, Hong, Du, Fu, Peng, Jiaqing, Ye, Xinyu
Format: Article
Language:English
Subjects:
Al5O6N: Eu2+, Tb2
Color tunable
Energy transfer
Luminescence properties
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Summary:A series of tunable blue-green emitting phosphors Al5O6N: 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 Al5O6N: 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 Al5O6N: Eu2+, Tb3+ phosphors as green light emitting material for near-UV pumped white light-emitting diodes.
ISSN:0022-2313
1872-7883
DOI:10.1016/j.jlumin.2019.04.042