Researchers from South China University of Technology, with colleagues from the Chinese University of Hong Kong and the Hong Kong University of Science and Technology, have applied a crossed long-short axis (CLSA) molecular design strategy to design new deep-blue OLED emitters.
The researchers developed two emitters that achieve excellent maximum EQE of 11% (at CIE coordinates of 0.155, 0.039) and 11.3% (at CIE coordinates of 0.155, 0.041). Even at ultrahigh luminance (10,000 nits), the emitters maintain EQEs of 9.3% and 9.1% - which the researchers say is the best performance reported to date for deep-blue OLEDs with CIEy ≤ 0.046.
The CLSA molecular design strategy uses a sp3-hybridized carbon bridge to create unique hybridized local and charge-transfer (HLCT) excited states. The emitters that were developed exhibit high efficiency - and also high color-purity deep-blue emissions and high quantum yields in photoluminescence
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