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Red polymer light-emitting devices based on dye-dispersed poly (9,9-dioctylfluorene-alt-benzothiadiazole) |
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| Authors: | Pin-Hsiang Chiu Cheng-Fu Yang Yeong-Her Wang |
| Affiliation: | a Department of Applied Physics, National University of Kaohsiung, No. 700 Kaohsiung University Rd., Nanzih, Kaohsiung, Taiwan, ROC b Department of Chemical and Materials Engineering, National University of Kaohsiung, No. 700 Kaohsiung University Rd., Nanzih, Kaohsiung, Taiwan, ROC c Department of Electronic Engineering, National Formosa University, No. 64 Wunhua Rd., Hu-Wei, Yunlin, Taiwan, ROC d Institute of Microelectronics, Department of Electrical Engineering, National Cheng-Kung University, No. 1 University Rd., Tainan, Taiwan, ROC |
| Abstract: | A polymer-organic host-guest emitter (POHGE) system for obtaining polymer light-emitting diodes (PLEDs) with pure red emission and high luminance is proposed. The POHGE system was prepared by the fluorescent dye 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetra-methyljulolidy-9-enyl)-4H-pyran (DCJTB) doped in green-emitting polymer poly (9,9-dioctylfluorene-alt-benzothiadiazole) (BTF8). A photoluminescence (PL) quenching phenomenon was observed owing to the higher doping amount of DCJTB dopant. In this study, the red DCJTB dopant emits with high luminance and without concentration quenching when the host BTF8 emitting layer is doped with a small amount of the red guest DCJTB dopant. An optimal amount of DCCJTB dopant was obtained at 2 mg. Devices with a configuration of indium tin oxide (ITO)/poly (ethylenedioxythiophene) doped with poly (styrenesulfonate) (PEDOT:PSS)/BTF8:DCJTB/Ca/Al were fabricated. This device achieved an electroluminescence (EL) efficiency of 1.33 cd/A at 6 V. The emission area is 1.5 × 0.5 cm2. The devices show the red light emission with a peak at about 630 nm. The color coordinate in Commission Internationale d’Eclairage (CIE) chromaticity is at x = 0.64 and y = 0.36. |
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