TY - JOUR
T1 - High-efficiency organic light-emitting diodes with exciplex hosts
AU - Wang, Qiang
AU - Tian, Qi Sheng
AU - Zhang, Yuan Lan
AU - Tang, Xun
AU - Liao, Liang Sheng
N1 - Funding Information:
The authors acknowledge the financial support from the National Key R&D Program of China (No. 2016YFB0400700) and National Natural Science Foundation of China (No. 61575136, 21572152, 51773141, and 51873139). This work was also supported by the Collaborative Innovation Centre of Suz-hou Nano Science and Technology (Nano-CIC), Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), the ‘‘111’’ Project of The State Administration of Foreign Experts Affairs of China, and the Joint International Research Laboratory of Carbon-Based Functional Materials and Devices.
Publisher Copyright:
This journal is © The Royal Society of Chemistry.
PY - 2019
Y1 - 2019
N2 - Exciplex forming co-hosts have been applied to fabricate high-efficiency organic light-emitting diodes (OLEDs) due to the merits of bipolarity, 100% exciton harvesting, preferred dipole alignment, and sensitizing effects. We review the discovery and development of the exciplex mechanism framework, from its discovery to successful application as hosts for phosphorescent OLEDs (PhOLEDs), thermally activated delayed fluorescence (TADF) OLEDs, and hyperfluorescent OLEDs, as well as in white OLEDs (WOLEDs). Exciplex forming co-hosts utilize the TADF effect to guarantee high exciton utilization efficiency. The charge-injection-free energy level configuration decreases the driving voltages and brings about improved power efficiency. The increased transitional dipole moment of emitters in exciplex forming co-hosts adds outcoupling efficiency to beat the efficiency limit. Exciplexes with the TADF effect also show sensitizing effects, making high-efficiency fluorescent OLEDs possible. This review introduces the progressive achievements of exciplex forming co-hosts, aimed at forming a summary of the present research on exciplex based OLEDs, and hopefully helping researchers grasp the future developing trend of exciplex forming co-hosts.
AB - Exciplex forming co-hosts have been applied to fabricate high-efficiency organic light-emitting diodes (OLEDs) due to the merits of bipolarity, 100% exciton harvesting, preferred dipole alignment, and sensitizing effects. We review the discovery and development of the exciplex mechanism framework, from its discovery to successful application as hosts for phosphorescent OLEDs (PhOLEDs), thermally activated delayed fluorescence (TADF) OLEDs, and hyperfluorescent OLEDs, as well as in white OLEDs (WOLEDs). Exciplex forming co-hosts utilize the TADF effect to guarantee high exciton utilization efficiency. The charge-injection-free energy level configuration decreases the driving voltages and brings about improved power efficiency. The increased transitional dipole moment of emitters in exciplex forming co-hosts adds outcoupling efficiency to beat the efficiency limit. Exciplexes with the TADF effect also show sensitizing effects, making high-efficiency fluorescent OLEDs possible. This review introduces the progressive achievements of exciplex forming co-hosts, aimed at forming a summary of the present research on exciplex based OLEDs, and hopefully helping researchers grasp the future developing trend of exciplex forming co-hosts.
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U2 - 10.1039/c9tc03092a
DO - 10.1039/c9tc03092a
M3 - Review article
AN - SCOPUS:85072696506
VL - 7
SP - 11329
EP - 11360
JO - Journal of Materials Chemistry C
JF - Journal of Materials Chemistry C
SN - 2050-7526
IS - 37
ER -