Effect of Chiral Ligand Structure on Red Quasi-2D Perovskites Circularly Polarized Electroluminescence Performance

doi:10.19894/j.issn.1000-0518.250068

Chinese Journal of Applied Chemistry ›› 2025, Vol. 42 ›› Issue (6): 776-784.DOI: 10.19894/j.issn.1000-0518.250068

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Effect of Chiral Ligand Structure on Red Quasi-2D Perovskites Circularly Polarized Electroluminescence Performance

Yue QU¹^,², Hong-Mei ZHAN²(), Chen-Yang ZHAO², Yan-Xiang CHENG¹^,², Chuan-Jiang QIN¹^,²()

^1.School of Applied Chemistry and Engineering，University of Science and Technology of China，Hefei 230026，China
^2.State Key Laboratory of Polymer Science and Technology，Changchun Institute of Applied Chemistry，Chinese Academy of Sciences，Changchun 130022，China

Received:2025-02-22 Accepted:2025-05-07 Published:2025-06-01 Online:2025-07-01
Contact: Hong-Mei ZHAN,Chuan-Jiang QIN
About author:cjqin@ciac.ac.cn
hmzhan@ciac.ac.cn
Supported by:
Jilin Province Science and Technology Development Plan Project(20240101144JC);the National Natural Science Foundation of China(52203320);the Science and Technology Cooperation Project between Jilin Province and Chinese Academy of Sciences(2023SYHZ0017)

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Abstract

Abstract:

Circularly polarized light-emitting diodes （CP-LEDs） hold significant promise for applications in 3D displays and biosensing， and so on. While chiral perovskite CP-LEDs research has predominantly focused on green emission， the development of red devices remains a challenge. In this study， we utilized chiral quasi-two-dimensional （Quasi-2D） perovskites as emitting materials to investigate the impact of chiral ligand structure on film morphology， photophysical properties， and device performance. By introducing chiral R-MBAI and R-MPEAI ligands with varying steric hindrances， we demonstrated that the R-MPEAI ligand， with smaller steric hindrance， effectively suppresses the formation of large n phases， optimizes energy transfer processes， and reduces the non-radiative recombination rate， leading to enhanced photoluminescence. Consequently， the R-MPEAI-based device achieved pure red emission at 641 nm with a 7.25% external quantum efficiency （EQE） and a 2.86% circularly polarized electroluminescence dissymmetry factor （g_EL）， realizing perovskite-based pure red CP-LEDs. This work offers a new strategy for developing high-performance red CP-LEDs.

Key words: Light-emitting diodes, Chiral ligands, Circularly polarized electroluminescence, Pure red emission

CLC Number:

O649

Yue QU, Hong-Mei ZHAN, Chen-Yang ZHAO, Yan-Xiang CHENG, Chuan-Jiang QIN. Effect of Chiral Ligand Structure on Red Quasi-2D Perovskites Circularly Polarized Electroluminescence Performance[J]. Chinese Journal of Applied Chemistry, 2025, 42(6): 776-784.

Figures/Tables 6

Fig.1 （A） Molecular structures of R-MBAI and R-MPEAI；（B） Micelle size distributions of R-MBAI and R-MPEAI perovskite precursors；（C） Electrostatic potential surfaces of R-MBA and R-MPEA； XPS spectra of （D） Pb4f and （E） I3d for R-MBAI and R-MPEAI perovskite films；（F） UV-Vis absorbance，（G） PL，（H） TRPL spectra of perovskite films；（I） PLQY and light emitting intensity under UV light for R-MBAI and R-MPEAI perovskite films

Fig.2 （A） XRD patterns of R-MBAI and R-MPEAI perovskite films；（B） TA spectrum color map of R-MBAI perovskite film；（C） TA spectra of R-MBAI perovskite films at different decay；（D） TA spectrum color map of R-MPEAI perovskite films；（E） TA spectra of R-MPEAI perovskite films at different decay times

Fig.3 SEM images of （A） R-MBAI and （B） R-MPEAI perovskite films

Fig.4 （A） Device structure of PeLEDs；（B） Maximum external quantum efficiency-current density curves，（C） current density-voltage-luminance curves and （D） EL spectra of R-MBAI and R-MPEAI PeLEDs； Current-voltage curves of hole-only devices based on （E） R-MBAI and （F） R-MPEAI；（G） Maximum external quantum efficiency-current density curves and （H） current density-voltage-luminance curves of R-MPEAI PeLEDs based on different electron-transport layers；（I） Operating lifetime T50 of R-MPEAI PeLEDs

Fig.5 （A） CP-EL emission spectra and （B） gEL-wavelength curve of R-MPEAI PeLED

Table 1 Parameters of different PeLEDs device performance

Sample	V_on/V	EQE/%	L_max/（cd·m^-2）	EL/nm	CIE（x， y）	g_EL/%
R-MBAI∶NMAI（TPBi）	4.0	3.68	51.2	659	（0.687， 0.313）	-
R-MPEAI∶NMAI（TPBi）	3.4	6.19	463.4	641	（0.698， 0.302）	-
R-MPEAI∶NMAI（CNT2T）	2.6	7.25	604.6	641	（0.703， 0.297）	2.86

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Effect of Chiral Ligand Structure on Red Quasi-2D Perovskites Circularly Polarized Electroluminescence Performance

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