【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.更多还原

【Abstract】 From a dynamic ball-grinding solid-state reaction, a series of red-emitting phosphors Ca0.54Sr0.16-δ Eu0.08Gd0.12 (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) 3Ca2+/Sr2+→2Eu3+/Gd3++vacancy; (b) 2 Ca2+/Sr2+→2Eu3+/Gd3++M+, where M+ is a monovalent cation like Li+, Na+ , or K+ employed as a charge compensator; (c) Ca2+/Sr2+→2Eu3+/Gd3++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·m2, 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.更多还原