摘要
利用1-苯基吡唑、吡啶三唑与水合三氯化铱反应合成了一种新型铱配合物Ir(2N)2(PZ),研究了配合物的吸收光谱、光致发光光谱以及光致发光效率。利用该材料作为磷光客体,掺杂到高分子主体材料中制作了电致发光器件,研究了其电致发光光谱。结果表明,该配合物在228,250,328nm处存在自旋允许的1π-π跃迁;荧光光谱结果显示在470nm处有较强的磷光发射;电致发光光谱与光致发光光谱相比却发生较大程度的红移。
A new blue-green light-emitting iridium （ Ⅲ ） bis （ 1-phenylpyridine ） （ 1,2,4-triazole pyridine ） complex was synthesized by the reaction of 1-phenylpyridine, 1,2,4-triazole pyridine and iridium triehloride hydrate, which expanded the choice range of blue-light iridium complexes effectively. Most of multilayer phosphorescent devices which have been reported before were fabricated by high vacuum thermal evaporation. In this paper, polyvinylearbazole （PVK） was used as polymer host by comparing the spectra overlap degree of photolumineseent （PL） emission spectrum of the host polymer （PVK and polyfluorene） and the absorption spectra of the iridium complex. Single-layer polymer blends structures are advantageous because they can be fabricated by solution processing at room temperature. Different concentration of iridium complex vip was doped into PVK host. PL spectra in solid film state weren＇t the same as those in solution state. Energy transfer from host to vip in solution state wasn＇t completely comparing with that in solid film state. Because Foerster and Dexter energy transfer could be happened at the same time in solid film state. While in solution state, the distance of intermoleeule is becoming farther, Dexter energy transfer couldn＇t be happened. With the increase of doping concentration, the intensity of PL emission peak of complex increased gradually. The structure of the complex was characterized by elemental analysis, ^1HNMR, and liquid-mass spectroscopy. The UV-Vis spectrum, photolumineseenee spectrum and photolumineseenee efficiency were investigated. Eleetrolumineseenee （EL） device was fabricated when the complex vip of 2% was doped into polymer host PVK. The UV-Vis spectrum showed the absorption peaks below 350 nm are attributed to the spin-allowed single state ^1π-π transition of eyelometalated ligands. The complex also gives rise to a strong photolumineseence at 470 nm at room temperature under photo excitation. Compared to the photoluminescenee spectrum, a red-shifted of emission was observed from the eleetrolumineseenee spectrum. This maybe resulted from the congregation of small-molecule vip or the formation of exeimer. The reason of red-shift of EL spectra is in progress.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2007年第1期44-48,共5页
Chinese Journal of Luminescence
基金
国家"973"计划(2002CB613405)
国家自然科学基金(90201023)资助项目
关键词
磷光材料
铱配合物
PIED
phosphorescent material
iridium complex
PLED
