Unsymmetric Phosphorescent Ir(III) Complexes with Ambipolar Features and Investigation for Both Aggregation-Induced Phosphorescent Emission and Electroluminescent Properties

doi:10.6023/cjoc202403052

Chinese Journal of Organic Chemistry ›› 2024, Vol. 44 ›› Issue (8): 2563-2570.DOI: 10.6023/cjoc202403052 Previous Articles Next Articles

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非对称双极性Ir(III)配合物磷光分子及其聚集诱导磷光和电致发光性能研究

陈姿仪^a, 刘思琪^a, 冯钊^a, 钟道昆^a, 杨晓龙^a, 孙源慧^a, 徐先彬^b, 冯震^b, 岳岭^a^,^*(), 周桂江^a^,^*()

a 西安交通大学化学学院西安 710049
b 陕西莱特光电材料有限公司西安 710065

收稿日期:2024-03-30 修回日期:2024-05-22 发布日期:2024-06-07
基金资助:
国家自然科学基金(52161145411); 国家自然科学基金(21875179); 国家自然科学基金(22175137); 国家自然科学基金(21602170); 国家自然科学基金(51803163)

Unsymmetric Phosphorescent Ir(III) Complexes with Ambipolar Features and Investigation for Both Aggregation-Induced Phosphorescent Emission and Electroluminescent Properties

Ziyi Chen^a, Siqi Liu^a, Zhao Feng^a, Daokun Zhong^a, Xiaolong Yang^a, Yuanhui Sun^a, Xianbin Xu^b, Zhen Feng^b, Ling Yue^a(), Guijiang Zhou^a()

a School of Chemistry, Xi'an Jiaotong University, Xi'an 710049
b Shaanxi Lighte Optoelectronics Material Co., Ltd., Xi'an 710056

Received:2024-03-30 Revised:2024-05-22 Published:2024-06-07
Contact: *E-mail: heartstar@xjtu.edu.cn; zhougj@xjtu.edu.cn
Supported by:
National Natural Science Foundation of China(52161145411); National Natural Science Foundation of China(21875179); National Natural Science Foundation of China(22175137); National Natural Science Foundation of China(21602170); National Natural Science Foundation of China(51803163)

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Abstract

Two unsymmetric Ir(III) phosphorescent complexes have been prepared with functionalized both 2-phenyl- pyridine (ppy)- and 2-vinylpyridine (vpy)-type ligands to investigate their optoelectronic properties. Photophysical results show that there are two kinds of radiative excited states contributing their phosphorescent emission. In addition, the unsymmetric Ir(III) phosphorescent complexes can exhibit aggregation-induced/enhanced phosphorescent emission behavior. Electrochemical results indicate that introducing functional group can confer ambipolar features to the unsymmetric Ir(III) phosphorescent complexes. In addition, they can show decent electroluminescent ability with turn-on voltage (V_turn-on) less than 3.0 V, maximum luminescence (L_max) of 11380 cd•m^－2, maximum external quantum efficiency (η_ext) of 5.3%, maximum current efficiency (η_L) of 12.9 cd•A^－1 and maximum power efficiency (η_P) of 13.6 lm•W^－1. All these results can provide valuable information for design and synthesis of new electroluminescent materials with aggregation-induced phosphorescent emission ability.

Key words: unsymmetric structure, Ir(III) phosphorescent complexes, aggregation-induced phosphorescent emission, ambipolar features, electroluminescence

Cite this article

Ziyi Chen, Siqi Liu, Zhao Feng, Daokun Zhong, Xiaolong Yang, Yuanhui Sun, Xianbin Xu, Zhen Feng, Ling Yue, Guijiang Zhou. Unsymmetric Phosphorescent Ir(III) Complexes with Ambipolar Features and Investigation for Both Aggregation-Induced Phosphorescent Emission and Electroluminescent Properties[J]. Chinese Journal of Organic Chemistry, 2024, 44(8): 2563-2570.

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Fig. & Tab. 13

References 25

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Complex	λ_abs^a/nm	λ_em^a/nm (solution/film)	Φ_P^b/% (solution/film)	τ_p^c/μs (solution/film)	T_d/℃
Ir-SO	290 (4.33), 300 (4.33), 386 (4.22), 403 (4.21), 466 (3.68)	568^sh, 661/566, 605^sh	4.3/23.6	0.10 (568 nm), 0.31 (661 nm)/ 0.68 (566 nm)	375
Ir-PO	288 (4.28), 301 (4.27), 387 (4.17), 403 (4.15), 465 (3.57)	570^sh, 648/564, 602 ^sh	10.4/25.2	0.15 (570 nm), 0.43 (648 nm)/ 0.78 (564 nm)	362

Complex	λ_abs^a/nm	λ_em^a/nm (solution/film)	Φ_P^b/% (solution/film)	τ_p^c/μs (solution/film)	T_d/℃
Ir-SO	290 (4.33), 300 (4.33), 386 (4.22), 403 (4.21), 466 (3.68)	568^sh, 661/566, 605^sh	4.3/23.6	0.10 (568 nm), 0.31 (661 nm)/ 0.68 (566 nm)	375
Ir-PO	288 (4.28), 301 (4.27), 387 (4.17), 403 (4.15), 465 (3.57)	570^sh, 648/564, 602 ^sh	10.4/25.2	0.15 (570 nm), 0.43 (648 nm)/ 0.78 (564 nm)	362

Complex	NTO	Contribution percentage of metal d_π orbitals and π orbitals of ligand to NTO
Ir-SO		Ir	L-FN	L-SO	acac
	Hole	16.80%	77.26%	2.72%	2.3%
	Particle	6.20%	15.76%	75.77%	1.23%
Ir-PO		Ir	L-FN	L-SO	acac
	Hole	47.45%	27.43%	16.16%	7.93%
	Particle	13.64%	23.2%	52.59%	3.66%

Complex	NTO	Contribution percentage of metal d_π orbitals and π orbitals of ligand to NTO
Ir-SO		Ir	L-FN	L-SO	acac
	Hole	16.80%	77.26%	2.72%	2.3%
	Particle	6.20%	15.76%	75.77%	1.23%
Ir-PO		Ir	L-FN	L-SO	acac
	Hole	47.45%	27.43%	16.16%	7.93%
	Particle	13.64%	23.2%	52.59%	3.66%

Complex	E_pa^a/V	E_pc/V	E_HOMO^c/eV	E_LUMO^d/eV
Ir-SO	0.36, 0.67	－1.97^a, －2.31^a, －2.71^b	－5.16	－2.83
Ir-PO	0.36, 0.65	－2.37^b, －2.49^b, －2.63^b	－5.16	－2.43

非对称双极性Ir(III)配合物磷光分子及其聚集诱导磷光和电致发光性能研究

Unsymmetric Phosphorescent Ir(III) Complexes with Ambipolar Features and Investigation for Both Aggregation-Induced Phosphorescent Emission and Electroluminescent Properties

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Device	Dopant	V_turn-on/V	L_max/(cd•m^－2)	η_ext/%	η_L/(cd•A^－1)	η_P/(lm•W^－1)	λ_max/nm
A1	Ir-SO (w=4.0%)	2.6	7527	2.2	4.7	4.8	568 (0.53, 0.45)
A2	Ir-SO (w=6.0%)	2.7	7974	3.2	7.5	8.1	568 (0.53, 0.45)
A3	Ir-SO (w=8.0%)	2.6	7902	2.5	5.5	5.7	568 (0.55, 0.45)
B1	Ir-PO (w=4.0%)	2.7	4865	3.8	9.9	10.3	568 (0.50, 0.47)
B2	Ir-PO (w=6.0%)	2.6	11380	5.3	12.9	13.6	568 (0.53, 0.46)
B3	Ir-PO (w=8.0%)	2.6	7739	4.9	12.0	13.7	568 (0.51, 0.46)

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