Liang Baoyan, Wang Jiaxuan, Cheng Zong, Wei Jinbei, Wang Yue
State Key Laboratory of Supramolecular Structure and Materials , Jilin University , Changchun 130012 , People's Republic of China.
J Phys Chem Lett. 2019 Jun 6;10(11):2811-2816. doi: 10.1021/acs.jpclett.9b01140. Epub 2019 May 15.
Benzimidazole-triazine-based electron acceptor PIM-TRZ with high triplet exited-state energy and strong electron-transport ability was newly developed. A series of highly efficient exciplex emitters have been fabricated. The TAPC:PIM-TRZ (TAPC: di-[4-( N, N-ditoly amino)-phenyl]cyclohexane) film shows a high photoluminescence (PL) quantum yields (PLQY, Φ) of 93.4%, and the device based on TAPC:PIM-TRZ exhibits a low turn-on voltage of 2.3 V, high maximum efficiency of 71.2 cd A (current efficiency, CE), 97.3 lm W (power efficiency, PE), and 21.7% (external quantum efficiency, EQE), as well as a high EQE of 16.2% at a luminance of 5000 cd m. The device displays the highest efficiency among reported organic light-emitting devices with an exciplex film as the emitting layer. Furthermore, a green device is also fabricated with a TAPC:PIM-TRZ cohost using C545T (C545T: (10-(2-benzothiazolyl)-2,3,6,7-tetrahydro-1,1,7,7-tetramethyl-1 H,5 H,11 H-benzopyrano[6,7-8- I, j]quinolizin-11-one)) as the dopant, and the highest CE, PE, and EQE are 68.3 cd A, 86.6 lm W, and 20.2%, respectively.
新开发了具有高三重激发态能量和强电子传输能力的基于苯并咪唑-三嗪的电子受体PIM-TRZ。制备了一系列高效的激基复合物发光体。TAPC:PIM-TRZ（TAPC：二-[4-(N,N-二甲基氨基)-苯基]环己烷）薄膜显示出93.4%的高光致发光（PL）量子产率（PLQY，Φ），基于TAPC:PIM-TRZ的器件具有2.3 V的低开启电压、71.2 cd A（电流效率，CE）的高最大效率、97.3 lm W（功率效率，PE）以及21.7%（外量子效率，EQE），并且在5000 cd m的亮度下具有16.2%的高EQE。该器件在报道的以激基复合物薄膜作为发光层的有机发光器件中效率最高。此外，还使用C545T（C545T：(10-(2-苯并噻唑基)-2,3,6,7-四氢-1,1,7,7-四甲基-1H,5H,11H-苯并吡喃并[6,7-8-I,j]喹嗪-11-酮）作为掺杂剂，以TAPC:PIM-TRZ作为共主体制备了绿色器件，其最高CE、PE和EQE分别为68.3 cd A、86.6 lm W和20.2%。
