LED激发有机材料MPPV的光谱分析

Spectral Analysis of LED Excited Organic Material MPPV

通过旋涂方法在玻璃片上涂敷一层有机材料MPPV,其中有机材料MPPV溶于有机溶剂四氢呋喃溶液中,MPPV:四氢呋喃的比例分别为25mg∶1mL,50mg∶1mL,100mg∶1mL,150mg∶1mL。然后分别使用蓝光、白光LED去照射有机薄膜层来研究其发光特性。结果表明:蓝光LED、白光LED均能激发有机材料MPPV使其在600～750nm区域产生红光光谱,且随着溶解质量分数的增加,光谱色坐标从(0.265 4,0.248 9)移向(0.395 4,0.288 0),发生红移。当MPPV:四氢呋喃的比例为100mg∶1mL时,拥有最好的显色指数86.1,实验中色温最低可达2 609K,这比使用蓝光LED激发黄色YAG荧光粉得到的白光LED色温更低。因此蓝光LED、白光LED通过激发有机材料MPPV可以显著提高LED的显色指数及发光性能。

By the method of spin-coating,a glass was coated with a layer of organic material MPPV dissolved in organic solvent tetrahydrofuran（THF）.The radios of MPPV ： THF were 25 mg∶1 mL,50 mg∶1 mL,100 mg∶1 mL and 150 mg∶1 mL.Then we irradiated the organic thin film by blue and white LED.The results showed that the blue and white LEDs could excite the organic material MPPV to emit red light in the region of 600～750 nm.And with the increase in the organic material MPPV,the color coordinate moved from（0.265 4,0.248 9） to（0.395 4,0.288 0） gradually.When the ratio of MPPV∶THF was 100 mg∶1 mL,the white LED had the best color-rendering index of 86.1.The minimum of color temperature reached 2609K which was lower than that of white LED obtained by blue LED excited yellow YAG phosphor.Therefore,with the method of blue and white LED exciting the organic material MPPV,the color-rendering index and luminescence properties of LED could be improved significantly.