Aluminate Red Phosphor in Light-Emitting Diodes: Theoretical Calculations, Charge Varieties, and High-Pressure Luminescence Analysis

Niumiao Zhang; Yi-Ting Tsai; Mu-Huai Fang; Chong-Geng Ma; Agata Lazarowska; Sebastian Mahlik; Marek Grinberg; Chang-Yang Chiang; Wuzong Zhou; Jauyn Grace Lin; Jyh-Fu Lee; Jiming Zheng; Chongfeng Guo; Ru-Shi Liu

doi:10.1021/acsami.7b06840

Aluminate Red Phosphor in Light-Emitting Diodes: Theoretical Calculations, Charge Varieties, and High-Pressure Luminescence Analysis

ACS Appl Mater Interfaces. 2017 Jul 19;9(28):23995-24004. doi: 10.1021/acsami.7b06840. Epub 2017 Jul 3.

Authors

Niumiao Zhang^{1

2}, Yi-Ting Tsai¹, Mu-Huai Fang¹, Chong-Geng Ma³, Agata Lazarowska⁴, Sebastian Mahlik⁴, Marek Grinberg⁴, Chang-Yang Chiang⁵, Wuzong Zhou⁵, Jauyn Grace Lin⁶, Jyh-Fu Lee⁷, Jiming Zheng², Chongfeng Guo², Ru-Shi Liu^{1

8}

Affiliations

¹ Department of Chemistry, National Taiwan University , Taipei 106, Taiwan.
² Institute of Photonics and Photon-Technology, Northwest University , Xi'an 710069, China.
³ College of Sciences, Chongqing University of Posts and Telecommunications , Chongqing 400065, China.
⁴ Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdansk , Wita Stwosza 57, 80-308 Gdansk, Poland.
⁵ EaStCHEM, School of Chemistry, University of St. Andrews , St. Andrews, KY169ST, United Kingdom.
⁶ Center for Condensed Matter Sciences, National Taiwan University , Taipei 106, Taiwan.
⁷ National Synchrotron Radiation Research Center , Hsinchu 300, Taiwan.
⁸ Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology, National Taipei University of Technology , Taipei 106, Taiwan.

PMID: 28605911
DOI: 10.1021/acsami.7b06840

Abstract

Searching 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 β-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.

Keywords: LEDs; Sr4Al14O25; charge varieties; high-pressure luminescence; red phosphor; theoretical calculations.