Researchers from Tsinghua University have developed a deuterated exciplex-forming host material for deep-blue phosphorescent OLED devices, with improved stability.
The researchers say that this research unveiled an external deuteration effect on OLED dopants, which reduces the shoulder emissions for slightly blue-shifted colors and also accelerates the radiative decay rates. This leads to improved photoluminescence efficiency.
The researchers reports that the corresponding deep-blue OLEDs based on two platinum complexes (PtON-TBBI and PtON-tb-DTB) achieve lower operational voltages and higher maximum EQEs of 27.4/19.9% and power efficiency of 41.2/33.6 lm/W, respectively, compared to the hydrogen-based counterparts. The lifetime of the devices was also improved, by about 40-60% compared to the non-deuterated hosts.
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