Synthesis of Mono- and Binuclear Disulfur-Chelated Organoplatinum（Ⅱ） Complexes and Its OLEDs Application

doi:10.19894/j.issn.1000-0518.220230

Chinese Journal of Applied Chemistry ›› 2023, Vol. 40 ›› Issue (2): 236-244.DOI: 10.19894/j.issn.1000-0518.220230

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Synthesis of Mono- and Binuclear Disulfur-Chelated Organoplatinum（Ⅱ） Complexes and Its OLEDs Application

Li-Yan CHEN¹, Zi-Ming ZHAO¹, Jin-Qi TAO¹, Yu-Zhen ZHANG¹(), Gang CHENG², Yun-Jun SHEN¹()

^1.Key Laboratory of Chemistry and Engineering of Forest Products，State Ethnic Affairs Commission，Guangxi Minzu University，Nanning 530000，China
^2.Department of Chemistry，the University of Hong Kong，Hong Kong 999077，China

Received:2022-07-02 Accepted:2022-11-07 Published:2023-02-01 Online:2023-02-27
Contact: Yu-Zhen ZHANG,Yun-Jun SHEN
About author:yunjunshen@gxmzu.edu.cn
zhangyuzhen@gxmzu.edu.cn；
Supported by:
the National Natural Science Foundation of China(22165002);Guangxi Natural Science Foundation(AD20238043);Guangxi University 100 Talents Plan on Overseas High-Level Talents Introduction and Xiangsihu Young Scholars Innovative Research Team of Guangxi Minzu University(2020RSCXSHQN01)

Abstract

Abstract:

The binuclear complex of Pt₂（Stpip）₂L and its corresponding mononuclear complex Pt（Stpip）LH are synthesized in one step by heating the mixture of chloro-bridged Pt（Ⅱ） dimer and StpipH ligand in acetone in the presence of potassium carbonate under reflux condition. The complexes are separated and characterized by ¹H and ³¹P NMR spectroscpy， high resolution mass spectrometry （HRMS） and X-ray single crystal diffraction. The luminescent properties of the complexes are studied by UV-Vis absorption spectrometer and fluorescent emission spectrometer. Among them， a binuclear complex exhibits strong phosphorescence at 593 and 560 nm in neat solid state and 2% PMMA film， respectively， and the quantum yield in PMMA film reaches 22.2%. A mononuclear complex exhibits phosphorescence at 524 and 526 nm in neat solid state and 2% （mass percent） PMMA film， respectively， and the quantum yield in PMMA films reaches 38.7%. The phosphorescence lifetime for both of complexes in two different states are between 0.99~2.80 μs. Organic light-emitting diodes （OLEDs） are fabricated by using the complex Pt₂（Stpip）₂L as the light-emitting layer. The results show that the maximum current efficiency of the OLEDs is 25.50 cd/A， the maximum power efficiency is 15.41 lm/W， the maximum external quantum efficiency is 8.19%， and the CIE color coordinates are （0.48，0.50）

Key words: Platinum, Phosphorescent complexes, Binuclear complex, Organic light-emitting diodes

CLC Number:

O614

Li-Yan CHEN, Zi-Ming ZHAO, Jin-Qi TAO, Yu-Zhen ZHANG, Gang CHENG, Yun-Jun SHEN. Synthesis of Mono- and Binuclear Disulfur-Chelated Organoplatinum（Ⅱ） Complexes and Its OLEDs Application[J]. Chinese Journal of Applied Chemistry, 2023, 40(2): 236-244.

Figures/Tables 10

Fig.1 Synthesis route of Pt（Stpip）LH （A） and Pt2（Stpip）2L （B）

Fig.2 1Hand 31P NMR spectra of Pt（Stpip）LH （blue） and Pt2（Stpip）2L （red）

Fig.3 HRMS spectra of Pt（Stpip）LH （top） and Pt2（Stpip）2L （down）

Fig.4 Crystal structures of Pt（Stpip）LH and Pt2（Stpip）2L； Thermal ellipsoids are drawn at the 40% probability level

Fig.5 Solid state emission spectra of Pt（Stpip）LH and Pt2（Stpip）2L

Table 1 Photophysical properties of Pt2（Stpip）2L and Pt（Stpip）LH

Compound	State ^a	λ/nm	Quantum yield （φ）/% ^b	Life time （τ）/μs	Radiative rate constant/ 10⁴·s^-1^c	Non radiative rate constant/ 10⁵·s^-1^c
Pt（Stpip）LH	PMMA	524	26.9	1.29	20.83	5.60
Pt（Stpip）LH	PMMA	526	38.7	0.99	39.08	6.19
Pt₂（Stpip）₂L	PMMA	593， 559sh ^d	7.6	0.78	9.78	11.8
Pt₂（Stpip）₂L	PMMA	560	22.2	2.80	7.93	2.79

Fig.6 Solid state emission spectra of Pt（Stpip）LH and Pt2（Stpip）2L

Fig.7 PMMA doped thin films emission spectra of Pt（Stpip）LH and Pt2（Stpip）2L

Table 2 Key performances of Pt2（Stpip）2L-based OLEDs

Mass percent/%	CIE max/（cd·m^-2）	η_c /（cd·A^-1）		η_p /（lm·W^-1）		EQE/%		CIE ［（x， y）］ ^a
Mass percent/%	CIE max/（cd·m^-2）	Max	at 1000 cd/m²	Max	at 1000 cd/m²	Max	at 1000 cd/m²	CIE ［（x， y）］ ^a
2	6 650	19.85	17.40	13.00	10.93	6.33	5.55	0.46， 0.51
4	7 600	20.69	18.55	14.03	12.06	6.48	5.81	0.46， 0.51
6	8 450	24.50	23.96	14.81	13.63	7.75	7.58	0.47， 0.51
8	8 700	25.50	21.51	15.41	11.65	8.19	6.91	0.48， 0.50

Fig.8 Device performance of Pt2（Stpip）2L with different doping concentrations （A） Electroluminescence spectra of the devices；（B） Luminance- external quantum efficiency （L-EQE） curves of the devices；（C） Luminance-voltage （L-V） curves of the devices；（D） Current density-voltage（J-V） curves of the devices

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Synthesis of Mono- and Binuclear Disulfur-Chelated Organoplatinum（Ⅱ） Complexes and Its OLEDs Application

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