Highly Efficient Red-Emitting Bis-Cyclometalated Iridium Complexes

被引:174
|
作者
Lai, Po-Ni [1 ]
Brysacz, Caroline H. [1 ]
Alam, Md Kamrul [2 ]
Ayoub, Nicholas A. [4 ]
Gray, Thomas G.
Bao, Jiming [2 ,3 ]
Teets, Thomas S. [1 ]
机构
[1] Univ Houston, Dept Chem, Houston, TX 77204 USA
[2] Univ Houston, Mat Sci & Engn Program, Houston, TX 77204 USA
[3] Univ Houston, Dept Elect & Comp Engn, Houston, TX 77204 USA
[4] Case Western Reserve Univ, Dept Chem, Cleveland, OH 44106 USA
关键词
EXCITED-STATES; ORGANOMETALLIC COMPLEXES; TEMPERATURE-DEPENDENCE; IR(III) COMPLEXES; OLED APPLICATIONS; TRIPLET EMITTERS; BETA-KETOIMINATE; QUANTUM YIELDS; PHOSPHORESCENT; DEVICES;
D O I
10.1021/jacs.8b04841
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Bis-cyclometalated iridium complexes with enhanced phosphorescence quantum yields in the red region of the visible spectrum are described. Here, we demonstrate that incorporating strongly pi-donating, nitrogen-containing beta-ketoiminate (acNac), beta-diketiminate (NacNac), and N,N'-diisopropylbenzamidinate (dipba) ancillary ligands can demonstrably perturb the excited-state kinetics, leading to enhanced photoluminescence quantum yields (Phi(PL)) for red emitting compounds. A comprehensive study of the quantum yields and lifetimes for these complexes reveals that for the compounds with the highest quantum yields, the radiative rate constant (k(r)) is significantly higher than that of related complexes, and contributes substantially to the increase in O-PL. Experimental and computational evidence is consistent with the notion that an increase in spin-orbit coupling, caused by an enhancement of the metal-to-ligand charge transfer (MLCT) character of the excited state via destabilization of the HOMO, is mainly responsible for the faster radiative rates. One of the compounds was shown to be effective as the emissive dopant in an organic light -emitting diode device.
引用
收藏
页码:10198 / 10207
页数:10
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