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.
The complex [Cd（bbb）Cl2]·DMF·H2O, where bbb is 2-（2-（1H-benzo[d]imidazol-2-yl）benzyl）-1H-benzo[d]imidazole, was synthesized and characterized by X-ray single-crystal structure analyses. For the complex： C24H25Cl2CdN5O2, Mr = 598.77, crystal system, triclinic, space group P1, a = 9.9878（12）, b = 10.0008（12）, c = 13.2217（15） , α = 80.674（2）, β = 72.158（2）, γ = 86.776（2）°, V = 1240.5（3） 3, Z = 2, Dc = 1.598 g/cm3, λ = 0.71073, μ（MoKα） = 1.127 mm–1, F（000） = 600, S = 1.04, R = 0.0905 and wR = 0.3088 for 4805 observed reflections with I 〉 2σ（I）. It is a neutral complex. The distorted tetrahedral geometry of cadmium ion is coordinated by two nitrogen atoms of ligand and two chloride ions. The complex emits blue green luminescence with emission peaks at 480 nm in DMF solution.
The complex [In（bpbp）Cl3]·H2O, where bpbp is 2,6-bis（1-phenylbenzimidazol- 2-yl）-pyridine （bpbp）, was synthesized and characterized by X-ray single-crystal structure analysis. For the complex： C31H21Cl3InN5·H2O, Mr = 702.71, monoclinic, space group, P21/n, a = 9.3918（10）, b = 21.024（2）, c = 14.5323（15）, β = 96.938（2）°, V = 2848.4（5）3, Z = 4, Dc = 1.639 g/cm3, λ = 0.71073, μ（MoKα） = 1.147 mm-1, F（000） = 1408, S = 1.00, R = 0.0430 and wR = 0.1438 for 4620 observed reflections with Ⅰ 〉 2σ（Ⅰ）. It is a neutral complex. The In（Ⅲ） ion adopts a distorted trigonal bipyramidal geometry coordinated by three nitrogen atoms of the ligand and three chlorine atoms. The complex emits blue luminescence with emission peaks at 430 nm in the solid state.
