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A novel iridium-complex,(BPPBI) 2 Ir(2-TFDBC)[BPPBI=2-(biphenyl-4-yl)-1-phenyl-1H-benzo[d]imidazole,2-TFDBC=1-(9-ethyl-9H-carbazol-2-yl)-4,4,4-trifluorobutane-1,3-dione],was synthesized,and its structure and component were confirmed by 1 H NMR and element analysis,respectively.UV-Vis absorption and photoluminescent(PL) spectra of(BPPBI) 2 Ir(2-TFDBC) in dichloromethane were investigated.The Ir-complex exhibited a long wavelength excitation of 470 nm,i.e.,low-energy excitation.So,it is a promising candidate for phosphorescent probe and PL material.(BPPBI) 2 Ir(2-TFDBC)-based electroluminescent devices,ITO/MoO 3(10 nm)/NPB(80 nm)/CBP:x(BPPBI) 2 Ir(2-TFDBC)(20 nm)/TPBi(45 nm)/LiF/Al,were fabricated,where x(%) was of 4% or 8% doping concentration(mass fraction);ITO=indium tin oxides;NBP=N,N’-bis-(1-naphthalenyl)-N,N’-bis-phenyl-(1,1’-biphenyl)4,4’-diamine,CBP=4,4’-bis(N-carbazolyl)-1,1’-biphenyl,TPBi=1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene.The devices showed a red emission of 620 nm.The maximum current efficiency and brightness were 1.7 cd/A and 4063 cd/m 2 for a device of 8%(mass fraction) doping level,respectively.The moderate luminous efficiency was due to the inadequate energy transfer from the host material to the guest material.
A novel iridium-complex, (BPPBI) 2Ir (2-TFDBC) [BPPBI = 2- (biphenyl-4-yl) ethyl-9H-carbazol-2-yl) -4,4,4-trifluorobutane-1,3-dione], was synthesized, and its structure and composition were confirmed by 1 H NMR and element analysis, The photoluminescent (PL) spectra of (BPPBI) 2 Ir (2-TFDBC) in dichloromethane were investigated. The Ir-complex exhibited a long wavelength excitation of 470 nm, ie, low-energy excitation. phosphorescent probe and PL material (BPPBI) 2 Ir (2-TFDBC) -based electroluminescent devices, ITO / MoO 3 (10 nm) / NPB (80 nm) / CBP:. x (BPPBI) 2 Ir (2-TFDBC) ( 20 nm) / TPBi (45 nm) / LiF / Al, were fabricated, where x (%) was 4% or 8% doping concentration mass fraction; ITO = indium tin oxides; NBP = (1,1’-biphenyl) 4,4’-diamine, CBP = 4,4’-bis (N-carbazolyl) biphenyl, TPBi = 1,3,5-tris (1-phenyl-1H-benzimidazol-2-yl) benzene.The devices showed a red emission of 620 nm. The maximum current efficiency and brightness were 1.7 cd / A and 4063 cd / m 2 for a device of 8% (mass fraction) doping level, respectively. The luminous luminous efficiency was due to the inadequate energy transfer from the host material to the guest material.