White organic light-emitting diodes utilized by near UV-deep blue emitter and exciplex emission

Young Wook Park, Young Min Kim, Jin Hwan Choi, Tae Hyun Park, Hyun Ju Choi, Hong Jung Yu, Min Ju Cho, Dong Hoon Choi, Sung Hyun Kim, Byeong Kwon Ju
Journal of Nanoscience and Nanotechnology 2011, 11 (2): 1381-4
Numerous investigations have been made into the development of wide color gamut displays for deep-blue OLEDs, including the RGB sub pixels, and white OLEDs (WOLEDs). One of the well known deep-blue emissive dopants, tris(phenyl-methyl-benzimidazolyl)iridium(III) [Ir(pmb)3], successfully introduced its fascinating color coordinate of Commission Internationale de l'Eclairage (CIE) 1931 (0.17, 0.06), however there have been no reports utilizing its accomplishments as WOLEDs. In this report, using only one phosphorescent dopant, the near UV-deep blue emissive Ir(pmb)3, the WOLEDs having the CIE 1931 coordinate of (0.33, 0.38) at 100 cd/m2 with a color rendering index of 85 are demonstrated. The white emission of the fabricated OLEDs are oriented from the near UV-deep blue emission of Ir(pmb)3 and the successfully controlled exciplex emission, between the Ir(pmb)3-host, and the Ir(pmb)3-interfaced material.

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