Essay on The Pe And Eqe L Characteristics Of Woleds

Essay on The Pe And Eqe L Characteristics Of Woleds

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The PE and EQE-L characteristics of WOLEDs were determined, as shown in Figure 3. The maximum PE and EQE of all the WOLEDs A, B, C, and D were 16.50, 10.41, 3.17, and 2.85 lm/W, and 5.74, 4.06, 1.75, and 1.54%, respectively. As mentioned previously, red, green, and blue colors properly utilized for WOLED A, indicating the highest efficiency. The color change was less for WOLED B, indicating a high efficiency. WOLEDs C and D are showed a low efficiency, because blue, red, and green EML were not adequately uilized. WOLED C estimated triplet state of green exciplex similarly formation as the red dopant. Moreover, the formation of excitons migrated from green EML to red EML. Thus, WOLED C was less efficient, because of exciton quenching in red EML. 26DCzppy was used as the ETM for WOLED D, exhibiting the lowest efficiency. This confirmed that the hole and electron mobilities of 26DCzppy23 are similar ∼10-5 cm2/Vs. Therefore, 26DCzppy has a bipolar charateristic than the ETM characteristic. Also, the lowest unoccupied molecular orbital (LUMO) level of 26DCzppy (2.5 eV) 24 was higher than the LUMO level of TPBi (2.7 eV) 25. According to the injection barrier, electron injection was difficult.
Fabrication was also performed by adjusting the concentration of the green mix exciplex WOLED A combination to optimize the device. To increase the concentration of TPBi in the mix , electron injection as doping facilitated the recombination of the electrons and accumulated hole formed exciton, as shown Figure 4. Therefore, the initial PE of WOLED H appears the highest at 20.63 lm/W. However, the efficiency roll-off caused by exciton quenching as the carrier injection increased rapidly. Reducing the efficiency roll-off to maintain a high efficienc...


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...n of TPBi was in the mix was adjusted in to optimize the device. We proposed that the optimization of device parameters such as the concentration of the EMLs and simple structure designed for carrier balance could increase the efficiency and low turn-on voltage. Thus, low roll-off ratio of EQE (27.04%) was in the range 200–1,000 cd/m2 at 50 wt% mix ratio. TPBi was used as the exciplex material to enhance the power efficiency and roll-off of WOLEDs.

Acknowledgments This study was supported by the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education (No. 2015R1A6A1A03031833) and the Ministry of Science, ICT and Future Planning, Korea, under the Information Technology Research Center support program (IITC-2016-H8501-16-1009) supervised by the Institute for Information & communications Technology Promotion.

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