Bright electroluminescence from single-layer organic light-emitting diodes comprising an ambipolar carrier transport layer of phenyldipyrenylphosphine oxide |
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| Authors: | Toshinori Matsushima |
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| Affiliation: | a Core Research for Evolutional Science and Technology Program, Japan Science and Technology Agency, 1-32-12 Higashi, Shibuya, Tokyo 150-0011, Japan
b Center for Future Chemistry, Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan |
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| Abstract: | We investigated the carrier transport and recombination characteristics of single-layer organic light-emitting diodes (SLOLEDs) composed of a phenyldipyrenylphosphine oxide (POPy2) layer doped with orange fluorescent molecules of 2,5-bis-[{bis-(4-methoxy-phenyl)-amino}-styryl]-terephthalonitrile (BST). The SLOLEDs achieved a high external quantum efficiency of 1.6% and a high luminance of 24,000 cd/m2 at a low driving voltage of 8 V. These very good electroluminescence characteristics originate from factors that include our use of the following: (1) the ambipolar POPy2 layer, which can transport balanced amounts of electrons and holes, (2) a high BST-doping concentration that traps injected carriers on BST molecules, and (3) insertion of an undoped POPy2 layer next to a metallic cathode to prevent exciton quenching. |
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| Keywords: | Single-layer organic light-emitting diode Phenyldipyrenylphosphine oxide Ambipolar carrier transport Electroluminescence Exciton quenching |
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