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Effect of various red phosphorescent dopants in single emissive white phosphorescent organic light-emitting devices


□ Jong Hyun Lim[1,2];Jin Wook Kim;Geum Jae Yoon;Ayse Turak;Woo Young Kim[1,4]

Department of Green Energy & Semiconductor Engineering Hoseo University Asan 31499 Korea R&D Center A-PRO Co. Ltd. Gunpo 15830 Korea Department of Electrical and Electronic Engineering The University of Hong Kong Hong Kong 070 China Department of Engineering Physcis McMaster University Hamilton Ontario L8S 4L7 Canada

摘 要:

In order to realize single emissive white phosphorescent organic light-emitting devices(PHOLEDs) with three color phosphorescent dopants(red, green, and blue), the energy transfer between the host material and the three dopants, as well as the among the three dopants themselves, should be considered and optimized. To explore the effect of red phosphorescent dopant on the color rendering index(CRI), the authors investigate the wavelength position of the maximum emission peak from three phosphorescent dopants. The CRI and luminous efficiency of white PHOLED in which Ir(pq)_2(αcαc) acts as the red phosphorescent dopant are found to be greater than those of devices prepared using Ir(pig)_3 and Ir(pq)_2(αcαc) as the emission spectrum has a relatively high intensity near the human perception of blue, red, and green wavelengths. Furthermore, we demonstrate that the performance of the three dopants is related to the absorption characteristics of the red phosphorescent dopant.With a maximum emission peak at 600 nm, Ir(pq)_2(αcαc) has a higher intensity in the concave section between 550 and 600 nm seen for red and blue dopants. In addition, the long metal-to-ligand charge transfer(MLCT)absorption tail of Ir(pq)_2(αcαc) overlaps with the emission spectra of the green dopant, enhancing emission. Such energy transfer mechanisms are confirmed to optimize white emission in the single emissive white PHOLEDs.

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  • [O]
  • > 数理科学和化学

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