New Bipolar Green Emitting Material Based on Amino Coumarin Derivative with High Efficiency for Organic Light Emitting Diodes
作者:Hyocheol Jung、Dong-Hee Shin、Hayoon Lee、Taemin Kim、Kwang-Yol Kay、Jongwook Park
DOI:10.1166/jnn.2017.14120
日期:2017.8.1
7-(4-([1,1′-biphenyl]-4-yl(9,9-dimethyl-9H-fluoren-2-yl)amino)phenyl)-4-methyl-2H-chromen-2-one (BPFA-MC) including coumarin moiety was synthesized through Suzuki aryl-aryl coupling reaction. Optical and electrical properties were examined by UV-visible absorption spectra, PL spectra, and AC-2. UV-visible spectrum of BPFA-MC in a film state showed maximum absorption wavelength of 367 nm. PL spectrum of BPFA-MC show maximum emission wavelength of 511 nm. BPFA-MC was used as non-doped emitting layer (EML) in OLEDs with the following structure: ITO/2-TNATA(60 nm)/NPB(15 nm)/BPFA-MC(35 nm)/Alq3(20 nm)/LiF(1 nm)/Al(200 nm). BPFA-MC showed highly efficient luminescence property. EL spectrum of BPFA-MC exhibited a maximum value of 504 nm and BPFA-MC device provided luminescence efficiency of 4.59 cd/A, power efficiency of 3.17 lm/W, and CIE (x, y) of (0.25, 0.53) at a current density of 10 mA/cm2.
7-(4-([1,1'-联苯基]-4-基(9,9-二甲基-9H-芴-2-基)氨基)苯基)-4-甲基-2H-苯并吡喃-2-酮(通过Suzuki芳基-芳基偶联反应合成了包含香豆素部分的BPFA-MC)。通过紫外可见吸收光谱、PL 光谱和 AC-2 检查光学和电学性能。薄膜状态的BPFA-MC的紫外-可见光谱显示最大吸收波长为367 nm。 BPFA-MC 的 PL 光谱显示最大发射波长为 511 nm。 BPFA-MC用作OLED中的非掺杂发光层(EML),其结构如下:ITO/2-TNATA(60 nm)/NPB(15 nm)/BPFA-MC(35 nm)/Alq3(20 nm) /LiF(1 nm)/Al(200 nm)。 BPFA-MC表现出高效的发光性能。 BPFA-MC的EL光谱的最大值为504 nm,并且BPFA-MC器件提供的发光效率为4.59 cd/A,功率效率为3.17 lm/W,CIE (x, y)为(0.25, 0.53)。电流密度为10mA/cm2。