【摘要】 本研究以Ir配合物FIrPic作为Eu离子的配体，合成了一种新的Eu-Ir双金属配合物Eu(FIrPic)2(Phen)UA，并通过自由基聚合成功制备了红色发光荧光共聚物PM-Eu-Ir，适用于商用近紫外芯片型LED。在不影响Eu3+离子的荧光发射特性的前提下，加入Ir-配合物可以有效地敏化Eu3+离子，增强其对400 nm紫外光的吸收。在365 nm紫外光激发下，共聚物PM-Eu-Ir在612 nm处显示出最强的发射峰，其CIE坐标为（0.461,0.254），这与365 nm近紫外芯片非常吻合。红色共聚荧光粉PM-Eu-Ir的微观形貌为典型的多层空间网络结构，除了表现出明显的红光发射和634.54μs的荧光寿命外，还在25～250°C的宽温范围内具有优异的热稳定性。使用共聚物PM-Eu-Ir制作的LED发出的红光亮度为149 800 cd/m2。研究结果表明，所制备的共聚荧光粉可作为红光元件用于制造近紫外芯片白光LED。更多还原

【Abstract】 In this paper, a new Eu-Ir bimetallic complex Eu(FIrPic)2(Phen)UA is synthesized using the Ir complex FIrPic as ligands for Eu ions and red-emitting phosphorescent copolymer PM-Eu-Ir is successfully prepared via radical polymerization for commercial near UV chip-based LEDs. The Eu3+ ions were found to be effectively sensitizable by adding Ir-complex with enhanced ultra-violet light absorption at around 400 nm without affecting the fluorescence emission characteristic of the Eu3+ ions. The proposed copolymer PM-EuIr exhibits the strongest emission peak at 612 nm with the CIE coordinates(0.461, 0.254) under 365 nm ultraviolet light excitation, which matches well with the 365 nm near-UV chip. The micro-morphology of the red copolymer phosphor PM-Eu-Ir is a typical multilayer spatial network structure; as well as having appreciable red emission and the corresponding fluorescence lifetime of 634.54 μs, it also has excellent thermal stability in a wide range of 25～250 °C. The LEDs fabricated by the copolymer PM-Eu-Ir display red light emission with a 149 800 cd/m2 luminance. The results support the potential utilization of prepared copolymer phosphor as a red component in the fabrication of near UV chip-based white LEDs.更多还原