Aluminate red phosphor in light-emitting diodes: theoretical calculations, charge varieties, and high-pressure auminescence analysis
Niumiao Zhang , Tsai Yi-Ting , Mu-Huai Fang , Chong-Geng Ma , Agata Lazarowska , Sebastian Mahlik , Marek Grinberg , Chang-Yang Chiang , Zhou Wuzong , Jauyn Grace Lin , Jyh-Fu Lee , Jiming Zheng , Chongfeng Guo , Ru-Shi Liu
AbstractSearching for a non-rare-earth-based oxide red-emitting phosphor is crucial for phosphor-converted light-emitting diodes (LEDs). In this study, we optimized a blue and UV-light excited Sr4Al14O25:Mn phosphor exhibiting red emission peaked at 653 nm, which was successfully synthesized by solid-state reaction. The crystal structure, micromorphology, and luminescent properties of Sr4Al14O25:Mn phosphors were characterized by X-ray Rietveld refinement, high-resolution transmission electron microscopy, and photoluminescence spectra. The band gap and electronic structure of Sr4Al14O25 were analyzed by density functional theory calculations using the hybrid exchange-correlation functional. The crystal field environment effect of Al sites from introducing activator Mn ions was investigated with the aid of Raman 27Al nuclear magnetic resonance spectra and electron spin resonance. The pressure dependent luminescent properties and decay time of this compound were presented. The tricolor display spectrum by combining blue InGaN chips, commercial beta-SiAlON:Eu2+ green phosphor, and Sr4Al14O25:Mn red phosphor were evaluated for commercial applications: using the present Sr4Al14O25:Mn red phosphor converted LED as a backlighting source.
|Other language title versions|
|Journal series||ACS Applied Materials & Interfaces, ISSN 1944-8244|
|Publication size in sheets||0.5|
|Keywords in English||theoretical calculations, charge varieties, high-pressure luminescence, Sr4Al14O25, red phosphor, LEDs|
|Score|| = 40.0, 20-12-2017, ArticleFromJournal|
= 40.0, 20-12-2017, ArticleFromJournal
|Publication indicators||: 2016 = 7.504 (2) - 2016=7.823 (5)|
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