Citation: Peng Fan, Zhou Fang, Shengyue Wang, Qiwei Dong, Chen Xiao, Alice J. McEllin, Duncan W. Bruce, Weiguo Zhu, Yafei Wang. High-efficiency circularly polarized emission from liquid-crystalline platinum complexes[J]. Chinese Chemical Letters, ;2023, 34(6): 107934. doi: 10.1016/j.cclet.2022.107934 shu

High-efficiency circularly polarized emission from liquid-crystalline platinum complexes

Peng Fan ^{a, 1} ,
Zhou Fang ^{a, 1} ,
Shengyue Wang ^a ,
Qiwei Dong ^a ,
Chen Xiao ^a ,
Alice J. McEllin ^b ,
Duncan W. Bruce ^{b, *,} ,
Weiguo Zhu ^{a, **,} ,
Yafei Wang ^{a, c, **,}

a.
Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, School of Materials Science & Engineering, Changzhou University, Changzhou 213164, China
b.
Department of Chemistry, University of York, York YO10 5DD, United Kingdom
c.
Anhui Sholon New Material Technology Co., Ltd., Chuzhou 239500, China

^**

duncan.bruce@york.ac.uk

zhuwg18@126.com

qiji830404@hotmail.com

Received Date: 7 July 2022
Revised Date: 9 October 2022
Accepted Date: 13 October 2022
Available Online: 27 October 2022

Figures(3)

Realizing both a high emission efficiency and luminescence dissymmetry factor (g_lum) in circularly polarized solution processable organic light-emitting diodes (CP-OLEDs) remains a significant challenge. In this contribution, two chiral phosphorescent liquid crystals based on cyclometalated platinum complexes are prepared, in which the chiral s-2-methyl-1-butyl group is introduced into the cyclometalating ligand and the mesogenic fragment is attached to the periphery of the ancillary ligand. The platinum complexes exhibit both smectic and chiral nematic phases as evidenced by polarized optical microscopy, differential scanning calorimetry and small-angle X-ray diffraction. Remarkably, a high photoluminescent quantum efficiency of over 78% and clear circularly polarized luminescent signal with g_PL of about 10^–2 are observed for the complexes. Further, solution-processed CP-OLEDs show maximum external quantum efficiencies (EQE) of over 15% and strong circularly polarized electroluminescent signals with a g_EL ≈ 10^–2. This research demonstrates that both liquid crystallinity and the number of chiral centers play key roles in improving the chiroptical property, paving the way for a new approach for the design of high-efficiency CPL emitters.
- Circularly polarized emission,
- Liquid-crystalline,
- Platinum complex,
- Organic light-emitting diodes
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