CAJ | 학술논문

合成并表征了以2-苯幕吡啶为第一配体,水杨酸及其衍牛物为第二配体,以铱为内核的新型配合物(ppy)_2Ir(LX)(PPY=2-苯基吡啶,LX=水杨酸sal、4甲基水杨酸MSal、4-三氟甲基水杨酸FSal).对其分子结构、光物理性能及热稳定性进行了测试和分析.结果表明,室温下在二氯甲烷溶液中(PPY)_2Ir(LX)(LX=Sal,MSal,FSal)的吸收峰分别在270,370,450及484 nm附近,其中前2个吸收峰应归属于第一配体2-苯基吡啶的~1π-π~*.跃迁和水杨酸配体到2-苯基吡啶的电荷转移跃迁,在450及484 nm附近的吸收峰,应该归属于金属到配体的电荷转移(~1MLCT和~3MLCT)跃迁和配体~3π-π~*.跃迁的混合;其PL发射峰最大波长分别为520,522,510nm;(ppy)_2Ir(Sal)和(PPY)_2Ir(MSal)的发射主要来源于三重态~3MLCT的辐射跃迁,而(ppy)_2Ir(FSal)的发射主要来源于水杨酸到2-苯基吡啶的电荷转移态的辐射跃迁,也有单重态~(-1)MLCT和三重态~3MLCT的辐射跃迁的贡献.其量子效率分别为0.37,0.33,0.29,热分解温度为306～328℃.(PPY)_2Ir(LX)是一组热稳定性较好的高效有机磷光材料,可用于有机电致发光器件中.
합성병표정료이2-분막필정위제일배체,수양산급기연우물위제이배체,이의위내핵적신형배합물(ppy)_2Ir(LX)(PPY=2-분기필정,LX=수양산sal、4갑기수양산MSal、4-삼불갑기수양산FSal).대기분자결구、광물이성능급열은정성진행료측시화분석.결과표명,실온하재이록갑완용액중(PPY)_2Ir(LX)(LX=Sal,MSal,FSal)적흡수봉분별재270,370,450급484 nm부근,기중전2개흡수봉응귀속우제일배체2-분기필정적~1π-π~*.약천화수양산배체도2-분기필정적전하전이약천,재450급484 nm부근적흡수봉,응해귀속우금속도배체적전하전이(~1MLCT화~3MLCT)약천화배체~3π-π~*.약천적혼합;기PL발사봉최대파장분별위520,522,510nm;(ppy)_2Ir(Sal)화(PPY)_2Ir(MSal)적발사주요래원우삼중태~3MLCT적복사약천,이(ppy)_2Ir(FSal)적발사주요래원우수양산도2-분기필정적전하전이태적복사약천,야유단중태~(-1)MLCT화삼중태~3MLCT적복사약천적공헌.기양자효솔분별위0.37,0.33,0.29,열분해온도위306～328℃.(PPY)_2Ir(LX)시일조열은정성교호적고효유궤린광재료,가용우유궤전치발광기건중.
New heteroleptic tris-cyclometalated iridium( HI) complexes (ppy)_2Ir(LX) (ppy=2-phenylpyridine, LX=Sal (salicylic acid), Msal (4-methylsalicylic acid), FSal(4-trifluoro methyl salicylic acid)) was synthesized and characterized. The molecular structure, photophysical properties and thermal stability were tested and analyzed. The results show that the absorption peaks were located around 270, 370, 450 and 484 nm respectively at room temperature. The two former peaks at 270 and 370 nm should belong to ~1_π-π~* transition at ppy and transition from salicylic acid ligands to 2-phenylpyridinejThe peaks around 450 and 484 nm can be assigned to the charge transfer transition from Ir to ligand (~1MLCT and ~3MLCT) and ~3_π-π~* transition respectively. The PL emission peaks were located at 520, 522, and 510 nm, respectively. The emission of (ppy)_2lr(Sal) and (ppy)_2Ir (MSal) was mainly ascribed to the radiation transition of triple state ~3MLCT, while the emission of (ppy)~2Ir(FSal) was mainly from the radiation transition between Sal and ppy, partly from the radiation transition of single state ' MLCT and triple state ~3MLCT. The quantum efficiencies of these complexes were 0. 37, 0. 33 and 0. 29 respectively. The thermal decomposition temperature was from 306 to 328 ℃. (ppy)_2 Ir(LX) , being a series of efficient phosphorescent materials with good thermal stability, can be used in the organic electroluminescent devices.