二价铕离子掺杂碱土金属硫代铝酸盐电子振动耦合参量与发光特性

为了获得高效的蓝色和绿色的电致发光材料,对Eu2+掺杂的碱土金属硫代铝酸盐电子振动耦合参量与发光特性的关系进行了深入研究。首先简述了用于MⅡAl2S4∶Eu材料发光性能评估的位形坐标模型并引入各评估参量;其次结合材料的晶体结构对MⅡAl2S4∶Eu材料的光致发光和电致发光性能进行了比较和分析;最后,通过材料的PL光谱曲线计算出材料的特征能量和两个比值因子参量的值,从而得到对MⅡAl2S4∶Eu发光材料的量化比较。根据评估结果和其CIE1931色坐标的比较,可以认为BaAl2S4∶Eu和CaAl2S4∶Eu较适合于作为蓝色和绿色发光材料。由于可以使发射峰发生移动,镁、锶的硫代铝酸盐可以作为复合硫代铝酸盐发光材料使用。

Vibronic coupling parameters and luminescent properties of bivalent europium ion doped alkaline earth thioaluminates

To obtain blue and green electroluminescent phosphor of high efficiency, vibronic coupling parameters and luminescent properties of M(II) Al2 S4 : Eu materials were researched. Configuration coordinate model, which is the base of assessment, was introduced and assessing parameters were listed firstly. Photoluminescent (PL) and electroluminescent (EL) properties of M(II) Al2S4 : Eu were compared and analyzed by the PL and EL spectra. Additionally, performances of M(II) Al2S4 : Eu phosphor materials were evaluated with the calculation of characteristic energy and unitless factors by PL spectra. According to the result of assessment and the comparison of CIE1931 color coordinates, it can be concluded that BaAl2 S4 : Eu and CaAl2 S4 : Eu are suitable for blue and green emitting phosphor. Mg and Sr thioaluminates can be used as parts of complex thioaluminate phosphors because they can shift the emission peaks.