TY - JOUR
T1 - Enhanced performance of OLED based on molecular orientation of emission layer by optimized substrate temperature
AU - Cui, Dongyue
AU - Wang, Shuai
AU - Li, Shuhong
AU - Liu, Yunlong
AU - Du, Hui
AU - Du, Qianqian
AU - Zhao, Ling
AU - Wang, Wenjun
AU - Dong, Xiaochen
N1 - Publisher Copyright:
© 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
PY - 2021/5
Y1 - 2021/5
N2 - Horizontally oriented transition dipole moment (TDM) of the molecule in emission layers (EMLs) can boost out-coupling efficiency, resulting in higher performance organic light-emitting diodes (OLEDs). As known, the substrate temperature (Ts) has a significant effect on the TDM of molecules. In this paper, the doped EMLs deposited with different Ts ranging from 30 to 100 °C were prepared and the corresponding photoluminescence quantum yield (PLQY) and TDM were measured. In addition, these EMLs with different Ts were employed to the OLED devices. The best luminous efficiency (51.4 cd/A), power efficiency (68.9 lm/W) and external quantum efficiency (EQE) (19.5%) were obtained in the OLED device where EMLs were deposited at 60 °C. However, the anisotropy factor Θ at this temperature is not the best, which is inconsistent with the common rules that high Θ causes high EQE. This phenomenon was ascribed to the in-situ annealing process for the hole transport layer (HTL) during the deposition of EMLs with different Ts. The synergy of PLQY and TDM orientation of EMLs, the hole mobility of hole only devices (HODs) contribute to the high performance of OLED device at 60 °C.
AB - Horizontally oriented transition dipole moment (TDM) of the molecule in emission layers (EMLs) can boost out-coupling efficiency, resulting in higher performance organic light-emitting diodes (OLEDs). As known, the substrate temperature (Ts) has a significant effect on the TDM of molecules. In this paper, the doped EMLs deposited with different Ts ranging from 30 to 100 °C were prepared and the corresponding photoluminescence quantum yield (PLQY) and TDM were measured. In addition, these EMLs with different Ts were employed to the OLED devices. The best luminous efficiency (51.4 cd/A), power efficiency (68.9 lm/W) and external quantum efficiency (EQE) (19.5%) were obtained in the OLED device where EMLs were deposited at 60 °C. However, the anisotropy factor Θ at this temperature is not the best, which is inconsistent with the common rules that high Θ causes high EQE. This phenomenon was ascribed to the in-situ annealing process for the hole transport layer (HTL) during the deposition of EMLs with different Ts. The synergy of PLQY and TDM orientation of EMLs, the hole mobility of hole only devices (HODs) contribute to the high performance of OLED device at 60 °C.
UR - http://www.scopus.com/inward/record.url?scp=85104283051&partnerID=8YFLogxK
U2 - 10.1007/s10854-021-05836-3
DO - 10.1007/s10854-021-05836-3
M3 - 文章
AN - SCOPUS:85104283051
SN - 0957-4522
VL - 32
SP - 12075
EP - 12083
JO - Journal of Materials Science: Materials in Electronics
JF - Journal of Materials Science: Materials in Electronics
IS - 9
ER -