Doped Blue and Red Emitters of 9,10-di(2-naphthyl)anthracene in Organic Electroluminescent Device

• Main Authors: Chia-Kuo Yen, 顏嘉國
• Other Authors: Chin Hsin Chen
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/19052896192992522799

碩士 === 國立交通大學 === 應用化學系 === 90 === If we can use one host emitter to excite different guest dopants to get R.G.B. color in organic light emitting devices (OLEDs), it will be a great advantage for full color application. Therefore in this thesis we studied the doping of blue and red guest molecules in a single blue host emitter to demonstrate the feasibility of this idea. Blue EL emission of 9,10-di(2-naphthyl)anthracene (ADN) based emitter in OLEDs is highly dependent upon its emitter thickness and attenuated by the microcavity effect of the emitter. By carefully tuning the emitter thickness of ADN and optimizing the doping concentration of 2,5,8,11-tetra(tert-butyl)perylene (TBP), one of the highest efficiencies ever reported for the anthracene based blue emitter at 5.1 cd/A with a CIE 1931 of (x=0.14; y=0.22) is achieved. The device of 4-(dicyanomethylene)-2-(t-butyl)-6-(1,1,7,7- tetramethyl-julolidyl-9-enyl)-4H-pyran (DCJTB) doped in ADN resulted in a bathochromic shift in CIE coordinates from red to orange. By choosing a dopant which absorbs in the infrared, such as 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7,8-9-enyl)]-4H-pyran (DCJTB-M). When DCJTB-M doped in ADN, we could achieve an efficiency of 1.52 cd/A with a CIE 1931 of (x=0.65; y=0.35) at 3.5 % doping concentration in the red region. The luminance efficiency is found to be essentially independent upon the drive current — a criterion which is important in the OLED module design and manufactuing.