| Summary: | 碩士 === 國立臺灣海洋大學 === 光電科學研究所 === 107 === In this thesis, we report the exciplex cohost system is used to fabricate high-efficiency light-emitting devices. The advantage of using exciplex as a cohost is that HTM and ETM molecules can be designed separately to control the HOMO/LUMO energy of the light-emitting layer. Such a simple component structure is not only cost effective, but also high device performance and reducing the operating voltage. This project will use the meticulous molecular design to develop an exciplex cohost, and combine it with a suitable dopant to create high device performance and low efficiency roll-off OLEDs.
In the first part, we use PO-T2T with different donor's co-host structure to do blue phosphorescent OLEDs. The efficiency can be as high as 24.8%, achieving high efficiency, simplifying structural design and reducing the cost.
In the second part, we use DTAF with 3P-T2T and TrisPCz with CN-T2T to form Exciplex, and construct a co-host structure suitable for near-infrared fluorescent molecular doping. Among them, TrisPCz:CN-T2T: 10wt% NOz-t-TPA has the best efficiency performance, EL peak is 709nm, there is nearly 71% coverage, external quantum efficiency is up to 6.58% (R=36000mWsr-1m-2, PCE =4.42%), CIE (0.68, 0.29).
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