An ideal host-guest system to accomplish high-performance greenish yellow and hybrid white organic light-emitting diodes |
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| Affiliation: | 1. Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China;2. New Vision Opto-Electronic Technology Co., Ltd, Guangzhou 510530, China;1. Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong, PR China;2. Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, PR China;3. City University of Hong Kong Shenzhen Research Institute, Shenzhen, PR China;1. School of Chemical Engineering and Materials Science, Chung-Ang University, 221 Heukseok-dong, Dongjak-gu, Seoul 156-756, Republic of Korea;2. Institute for Rare Metals & Division of Advanced Materials Engineering, Kongju National University, Cheonan, Chungnam 330-717, Republic of Korea;3. Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 151-744, Republic of Korea;1. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, PR China;2. Department of Electrical Engineering, Iowa State University, 4546 Union Dr, Ames, IA 50011, United States;1. Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu pl. 19, LT-50254, Kaunas, Lithuania;2. Institute of Materials Science, Kaunas University of Technology, K. Barsausko St. 59, LT-51423, Kaunas, Lithuania;3. Laboratoire de Physicochimie des Polymeres et des Interfaces, EA 2528 Universite de Cergy-Pontoise, 5 mail Gay-Lussac, 95031 Cergy-Pontoise Cedex, France |
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| Abstract: | Greenish yellow organic light-emitting diodes (GYOLEDs) have steadily attracted researcher's attention since they are important to our life. However, their performance significantly lags behind compared with the three primary colors based OLEDs. Herein, for the first time, an ideal host-guest system has been demonstrated to accomplish high-performance phosphorescent GYOLEDs, where the guest concentration is as low as 2%. The GYOLED exhibits a forward-viewing power efficiency of 57.0 lm/W at 1000 cd/m2, which is the highest among GYOLEDs. Besides, extremely low efficiency roll-off and voltages are achieved. The origin of the high performance is unveiled and it is found that the combined mechanisms of host-guest energy transfer and direct exciton formation on the guest are effective to furnish the greenish yellow emission. Then, by dint of this ideal host-guest system, a simplified but high-performance hybrid white OLED (WOLED) has been developed. The WOLED can exhibit an ultrahigh color rendering index (CRI) of 92, a maximum total efficiency of 27.5 lm/W and a low turn-on voltage of 2.5 V (1 cd/m2), unlocking a novel avenue to simultaneously achieve simplified structure, ultrahigh CRI (>90), high efficiency and low voltage. |
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| Keywords: | Greenish yellow Organic light-emitting diodes Hybrid White Color rendering index |
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