| 초록 |
A new hole-transporting material, poly-2-(9Hcarbazol-9-yl)-5-(4-vinylphenyl)-5H-benzo[b]carbazole (PBCZCZ), was developed for perovskite light-emitting diodes. It has excellent film morphology and a high hole mobility of 3.67 × 10−5 cm2 V−1 s−1, which made it possible to vary the device configuration. Green and sky-blue perovskite PeLEDs using PBCZCZ as the hole-transporting layer had current efficiencies and external quantum efficiencies of 43.90 cd A−1 and 8.67% for the green device and 9.07 cd A−1 and 4.04% for the skyblue device, respectively. The EQE of the green PeLEDs was about 2.5 times higher and that of the sky-blue PeLEDs was about 3 times higher than the device made with the commercial HTL of PVK. The operational device lifetimes of the green and sky-blue PeLEDs made with PBCZCZ were about 4.1 and 4.8 times higher than the PVK-containing device, respectively. |
