4.8 Article

An Exciplex Forming Host for Highly Effi cient Blue Organic Light Emitting Diodes with Low Driving Voltage

期刊

ADVANCED FUNCTIONAL MATERIALS
卷 25, 期 3, 页码 361-366

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201402707

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资金

  1. NRF (National Research Foundation) - MSIP(Ministry of Science, ICT and Future Planning) [2014R1A2A1A01002030]
  2. National Science Council of Taiwan [NSC 102-2633-M-002-001]
  3. National Research Foundation of Korea [2014R1A2A1A01002030] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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The exciplex forming co-host with phosphorescent dopant system has potential to realize highly efficient phosphorescent organic light emitting didoes (PhOLEDs). However, the exciplex forming co-host for blue phosphorescent OLEDs has been rarely introduced because of higher triplet level of the blue dopant than green and red dopants. In this work, a novel exciplex forming co-host with high triplet energy level is developed by mixing a phosphine oxide based electron transporting material, PO-T2T, and a hole transporting material, N,N'-dicarbazolyl-3,5-benzene (mCP). Photo-physical analysis shows that the exciplexes are formed efficiently in the host and the energy transfer from the exciplex to blue phosphorescent dopant (iridium(III) bis[(4,6-difluorophenyl)-pyridinato-N,C2'] picolinate; FIrpic) is also efficient, enabling the triplet harvest without energy loss. As a result, an unprecedented high performance blue PhOLED with the exciplex forming co-host is demonstrated, showing a maximum external quantum efficiency (EQE) of 30.3%, a maximum power efficiency of 66 lm W-1, and low driving voltage of 2.75 at 100 cd m(-2), 3.29 V at 1000 cd m(-2), and 4.65 V at 10 000 cd m(-2), respectively. The importance of the exciton confinement in the exciplex forming co-host is further investigated which is directly related to the performance of PhOLEDs.

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