Ceramics International, 15 April 2019, Vol.45(6), pp.7778-7784
In our recent work we found γ-AlON:Eu phosphors to hold promise for application in white light-emitting diodes (LEDs). To obtain further insight into Eu –M (M = Mn , Mg , Li ) co-doped γ-AlON, the crystal structure and the electronic and photoluminescence properties of γ-AlON:Eu –M (M = Mn , Mg , Li ) phosphors were studied using first-principle calculations under the framework of density functional theory. Based on the experimental and calculated results, the structure of Eu –M (M = Mn , Mg , Li ) co-doped γ-AlON was established. The calculated results demonstrate that Eu and M (= Mn , Mg , Li ) can effectively improve the absorption of ultraviolet light by γ-AlON:Eu . The absorption coefficient of AlON:Eu –Li in the ultraviolet blue region of 275–415 nm reached 67,266 cm , and the absorption coefficients of AlON:Eu –Mn and AlON: Eu –Mg at the same doping concentration were 51,219 and 60,575 cm , respectively. Our calculations therefore show that the performance of AlON:Eu –Li is better than AlON:Eu –M (M = Mn , Mg ).
Electronic Structure ; First Principles ; Optical Property ; Γ-Alon ; Engineering
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