Title of Paper:Achieving an efficient La₃Si₈N₁₁O₄: Eu<SUP>2+</SUP> phosphor via chemical reduction of nano-scale carbon film: Toward white light-emitting diodes

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Affiliation of Author(s):[1]Univ Elect Sci & Technol China, Sch Mat & Energy, Chengdu, Sichuan, Peoples R China;[2]Chengdu Univ Technol, Coll Mat & Chem & Chem Engn, Chengdu, Sichuan, Peoples R China;[3]Chengdu Fine Opt Engn Res Ctr, Chengdu, Sichuan, Peoples R China;[4]Dongfang Elect Corp, Lab Energy Storage & New Energy Mat Technol, Cent Res Inst, Chengdu, Sichuan, Peoples R China;[5]Xiamen Univ, Coll Mat, Xiamen, Fujian, Peoples R China;[6]Univ Elect Sci & Technol China, Natl Engn Res Ctr Electromagnet Radiat Control Ma, Chengdu, Sichuan, Peoples R China;[7]Univ Sci & Technol China, Dept Mat Sci & Engn, Lab Mat Energy Convers, Hefei, Anhui, Peoples R China;[8]Phenikaa Univ, Phenikaa Inst Adv Study, Hanoi 10000, Vietnam;[9]A&A Green Phoenix Grp, PRATI, 167 Hoang Ngan, Hanoi 10000, Vietnam

Journal:JOURNAL OF ALLOYS AND COMPOUNDS

Key Words:Photoluminescence; La3Si8N11O4:Eu phosphors; Carbon coating; Lattice parameters; White light-emitting diodes

Abstract:In this work, Eu-doped La3Si8N11O4 phosphors with different doping concentrations are fabricated by solid state reaction method. A broad and asymmetric emission band that covers the wavelength range of 425-550 nm is observed. X-ray diffraction Rietveld refinement and X-ray absorption near edge structure (XANES) analyses reveal the co-existence of both trivalent and divalent states of Eu. By coating the phosphor particles with an ultrathin carbon layer using CVD technique, followed by an annealing in N-2 at 1600 degrees C, the trivalent ions Eu3+ are reduced to Eu2+, resulting in a significant enhancement of quantum efficiency, both internal and external, and absorption efficiency. The application of the La3Si8N11O4:Eu in white light-emitting diodes is tested by coating the phosphor onto a near-UV LED chip in combination with the red-, green- and blue-emitting phosphors ([Ca, Sr]AlSiN3:Eu, (R)-Sialon:Eu and BaMgAl10O17:Eu, respectively). It is demonstrated that the presence of the La3Si8N11O4:Eu phosphor significantly enhances the color rendering index of the device, showing its great potential for wLEDs applications. (C) 2019 Elsevier B.V. All rights reserved.

Document Type:Article

Volume:799

Page Number:360-367

ISSN No.:0925-8388

Translation or Not:no