Synthesis and Photoelectrical Properties of Self-host Blue-green Phosphorescent Iridium(Ⅲ) Complexes†

doi:10.7503/cjcu20150440

Abstract

Abstract:

A kind of self-host blue-green phosphorescent Ir(Ⅲ) complexes [(CzPhBI)₂Ir(tfmptz), (CzPhBI)₂Ir(tfmpptz) and (CzPhBI)₂Ir(fpptz)] was designed and synthesized. CzPhBI, tfmptz, tfmpptz and fpptz were 9-[6-(2-phenyl-1-benzimidazolyl)hexyl]-9-carbazole, 2-(5-trifluoromethyl-1,2,4-triazolyl)pyridine, 2-[5-(4-trifluoromethyl)phenyl-1,2,4-triazolyl]pyridine and 2-[5-(4-fluoro)phenyl-1,2,4-triazolyl]pyridine, respectively. The structures were confirmed by nuclear magnetic resonance(¹H NMR and ¹⁹F NMR) and elemental analysis. Photophysical properties were investigated. Electroluminescent performance of Ir(Ⅲ) complexes were characterized by fabricating the non-doped devices with the configuration of indium tin oxid(ITO)│N,N'-bis-(1-naphthalenyl)-N,N'-bis-phenyl-(1,1'-biphenyl)-4,4'-diamine(NPB)(30 nm)│4,4'-Bis(9-carbazolyl)-1,1'-biphenyl(CBP)(15 nm)│Ir complexes(30 nm)│1,3,5-tris(1-phenyl-1H-benzo[d]imidazol-2-yl)benzene(TBPI)(30 nm)│LiF(1 nm)│Al(100 nm). The maximum luminance of (CzPhBI)₂Ir(tfmpptz) complexes was 6913 cd/m² and the maximum luminous efficiency achieved 13.9 cd/A.

Key words: Blue-green phosphorescent material, Ir(Ⅲ) complex, Photophysical property, Electro-luminescent device

CLC Number:

TrendMD:

SUN Jing, DONG Hailiang, WANG Hua, MIAO Yanqin, XU Huixia, LI Jie, WU Yuling, XU Bingshe. Synthesis and Photoelectrical Properties of Self-host Blue-green Phosphorescent Iridium(Ⅲ) Complexes^†[J]. Chem. J. Chinese Universities, 2015, 36(10): 1859.

Figures/Tables 7

Synthetic routes of (CzPhBI)2Ir(tfmptz), (CzPhBI)2Ir(tfmpptz) and (CzPhBI)2Ir(fpptz)

Table 1 Thermal, photophysical and electrochemical properties of the Ir(Ⅲ) complexes*

Complex	λ_abs/nm	λ_PL/nm		QY(%)	τ/ns	T_d/℃	E_HOMO/eV	E_LUMO/eV
Complex	λ_abs/nm	Solution		QY(%)	τ/ns	T_d/℃	E_HOMO/eV	Film
(CzPhBI)₂Ir(tfmptz)	238/263/295/308/332/	485/519	491/525	9.7	417	447	-5.58	-3.05
	346/380—490
(CzPhBI)₂Ir(tfmpptz)	238/263/295/308/332/	488/522	495/525	11.2	311	347	-5.57	-3.04
	346/380—490
(CzPhBI)₂Ir(fpptz)	238/262/294/310/330/	489/523	496/526	14.4	354	354	-5.56	-3.03
	346/380—490

Fig.1 PL lifetime decay curves of the Ir(Ⅲ) complexesa. (CzPhBI)2Ir(tfmptz); b. (CzPhBI)2Ir(tfmpptz); c. (CzPhBI)2Ir(fpptz).

Fig.2 Cyclic voltammetry curves of the Ir(Ⅲ) complexes in CH2Cl2 solutiona. (CzPhBI)2Ir(tfmptz); b. (CzPhBI)2Ir(tfmpptz);c. (CzPhBI)2Ir(fpptz).

Fig.3 Device configurations and structures of the materials

Table 2 Device performance of the non-doped devices*

Device	λ_EL/nm	V_on/V	L_max/(cd·m^-2)	CE_max/(cd·A^-1)	PE_max/(lm·W^-1)	EQE(%)
(CzPhBI)₂Ir(tfmptz)	490/522	5.5	6913	13.9	6.9	4.9
(CzPhBI)₂Ir(tfmpptz)	488/520	6.0	3503	4.9	2.3	2.0
(CzPhBI)₂Ir(fpptz)	490/520	7.5	3804	5.5	1.5	2.0

Fig.4 L-V-J curves(A) and LE-J curves(B) of the Ir(Ⅲ) complexesa, a'. (CzPhBI)2Ir(tfmptz); b, b'. (CzPhBI)2Ir(tfmpptz); c, c'. (CzPhBI)2Ir(fpptz).

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