电荷补偿对红色LED用荧光粉体的荧光性能改进  

Improved Luminous Properties of Red Emitting Phosphors for LED Application by Charge Compensation

作　　者：曹发斌[1,2] 田彦文[1] 陈永杰[2] 肖林久[2] 刘云义[2] 

机构地区：[1]东北大学材料与冶金学院,沈阳110004 [2]沈阳化工学院,沈阳110142

出　　处：《物理化学学报》2009年第2期299-303,共5页Acta Physico-Chimica Sinica

基　　金：辽宁省科技攻关项目(2006223004);沈阳市科技计划(10633070);辽宁省教育厅基金(05L329)项目资助

摘　　要：通过高温动态球磨固相法,采用三种电荷补偿方式:(a)3Ca2+/Sr2+→2Eu3+/Gd3++空穴;(b)2Ca2+/Sr2+→2Eu3+/Gd3++M+(M+=Li+,Na+,K+中的一种或多种离子);(c)Ca2+/Sr2+→2Eu3+/Gd3++X-(X-=F-,Cl-,Br-,I-),制备了红色发光二极管(LED)荧光粉体Ca0.54Sr0.16-δEu0.08Gd0.12(MoO4)0.2(WO4)0.8(δ=0-0.16).研究表明,方法(b)是一种较优的电荷补偿方式.利用此荧光粉和390-405nm发射LED芯制备了红色LED,当正向驱动电流为20mA时,色坐标为x=0.66,y=0.33;色纯度100%;光强达6200cd·m2;发光效率约为95lm·W-1.器件的色坐标和显色指数等参数随正向驱动电流的变化起伏很小,颜色稳定.该红光荧光粉在新一代白色LED照明领域具有广阔应用前景.From a dynamic ball-grinding solid-state reaction, a series of red-emitting phosphors Ca0.54Sr0.16-xEu0.08Gd0.12（MoO4）0.2（WO4）0.8（δ=0-0.16） were synthesized by charge compensation. Three approaches to charge compensation were used and are （a） 3Ca^2＋/Sr^2＋→2Eu^3＋/Gd^3＋vacancy; （b） 2 Ca^2＋/Sr^2＋→2Eu^3＋/Gd^3＋＋M^＋, where M^＋ is a monovalent cation like Li^＋, Na^＋, or K^＋ employed as a charge compensator; （c） Ca^2＋/Sr^2＋→2Eu^3＋/Gd^＋＋＋N^-, where N^- is a monovalent anion like F^-, Cl^-, Br^- or I^- employed as a charge compensator. The results showed that model （b） was better at charge compensation. One red light-emitting diode （LED） was made by combining a phosphor with a 390-405 nm emitting LED chip under a 20 mA forward-bias current. The chromaticity coordinates （CIE）, color purity, light intensity, and luminous efficiency were x=0.65, y=0.33, 100%, 6200 cd ·m^2, and 95 lm·W^-1, respectively. Furthermore, the CIE and color purity of the apparatus changed little and the color was stable. This red-emitting phosphor in the field of new generation white-light LEDs has broad application prospects.

关 键 词：电荷补偿剂 Ca0.54Sr0.16-xEu0.08Gd0.12(MoO4)0.2(WO4)0.8 红色荧光粉 发光二极管(LED) 

分 类 号：O611.3[理学—无机化学]