Sr_2MgAl_(22)O_(36):Mn^(4+)的高温固相合成及发光性能

High Temperature Solid-State Synthesis and Luminescent Properties of Sr_2MgAl_(22)O_(36):Mn^(4+)

采用高温固相法合成了Sr_2MgAl_(22)O_(36):Mn^(4+)荧光粉,在365nm紫外灯照射下发红色荧光。样品通过XRD、SEM以及荧光光谱分析,探讨了煅烧温度、Mn4+掺杂浓度以及助熔剂H3BO3对样品发光性能的影响。结果显示,在温度高于1400℃条件下合成的Sr2MgAl22O36:Mn4+荧光粉均为Sr2MgAl22O36单相,可被紫外、近紫外及蓝光激发,其发射光谱的峰位分别位于645,659,671nm,归结为Mn4+的2E-4A2跃迁发射;Mn4+的猝灭浓度为1.2%(摩尔浓度),助熔剂H3BO3最佳掺杂量为反应混合物的2%(质量分数)。

The Sr_2MgAl_(22)O_(36):Mn^(4+) phosphors were prepared by high temperature solid-state reaction and the red emitting could be observed from the luminescent powders after 365 nm ultraviolet excitation. The samples were characterized by XRD, SEM and photoluminescence spectra to study the structure and luminescent properties. The influence of calcination temperature, Mn4+ doping concentration and flux H3BO3 on their luminescence properties have been discussed. The results show that the crystalline phase of the sample fired at 1600 °C is Sr2 Mg Al22O36, indicating a broad emission band peaked at 645, 659, 671 nm excited by UV, near UV and blue LED chips. The luminescence of Sr2 Mg Al22O36:Mn4+ is attributed to the 2E→4A2 transition of Mn4+ ions. The experimental results show that the quenching concentration of Mn4+ in Sr2 Mg Al22O36 is 1.2% mol and the optimal mass fraction of flux H3BO3 is 2%.