Structural Engineering of Eu^2+-Doped Silicates Phosphors for LED Applications  

作　　者：Ming Zhao Qinyuan Zhang Zhiguo Xia 

机构地区：[1]State Key Laboratory of Luminescent Materials and Devices,Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques,School of Materials Science and Engineering,South China University of Technology,Guangzhou 510641,China [2]The Beijing Municipal Key Laboratory of New Energy Materials and Technologies,School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Accounts of Materials Research》2020年第2期137-145,共9页材料研究述评（英文）

基　　金：The work was supported by the National Natural Science Foundations of China(Grant No.51972118,51961145101 and 51722202);Fundamental Research Funds for the Central Universities(D2190980);Guangzhou Science&Technology Project(202007020005);Guangdong Provincial Science&Technology Project(No.2018A050506004);the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program(2017BT01X137).

摘　　要：CONSPECTUS:Phosphor-converted light-emitting diodes(pc-LEDs)are of great importance for their applications in solid-state lighting,backlit display,and near-infrared detection light source.Herein,the main challenges for these emergent pc-LEDs are to achieve full-spectrum lighting,wide color gamut display and broadband high efficiency near-infrared emission,respectively,which depends on the luminescence properties of phosphors used.Owing to the unique 4f-5d transition,Eu^2+is one of the most commonly used activators in luminescent materials for pc-LEDs,and Eu^2+-doped earth-abundant silicates phosphors exhibit outstanding luminescence properties,including multicolor emission,adjustable bandwidth,excellent thermal stability as well as high luminescence efficiency.These attributes motivate scientists to find Eu^2+-doped silicates phosphors that can practically meet the various LED application requirements.Since the traditional trial and error exploration is time-consuming and not necessarily successful,it is necessary to find reliable structural engineering strategies to discover new phosphor systems and also realize purposeful photoluminescence tuning.The adjustable 4f-5d electronic transitions of Eu^2+,the variable crystal structures of the silicate hosts and their coupling effect simultaneously account for the targeted luminescence behaviors and their precise emission color tuning.Thus,we aim at developing Eu^2+-doped silicate phosphors that can solve the application challenges through a comprehensive understanding of Eu^2+photoluminescence mechanism and the structure−property relationships.In this Account,we first illustrate the luminescence theory of Eu^2+in inorganic solids and summarize the research results of the effect originated from centroid shift,crystal field splitting,Stokes shift,and emission bandwidth.On the basis of the factors dominating the variation of luminescence characteristics,several structural strategies to manipulate Eu^2+emission in silicates are proposed,including(1)modify the chemical

关 键 词：LUMINESCENCE consuming PRECISE 

分 类 号：O61[理学—无机化学]