設計及合成含環氮硼結構並與不同的電子予體合成一系列衍生物CZAZB、tCZAZB、tmCZAZB、SpiroAZB、DMACAZB、PXZAZB，此系列的化合物的排序依照電子予體的電子給予能力及立體效應排序，其光色從深藍光至綠光，在甲苯溶液中螢光光譜波峰由442至513 nm，最低單重激發態及最低三重激發態的能差ΔEST分別為0.37、0.26、0.22、0.21、0.11、0.08 eV，藉由提升電子予體之電子給予能力及立體效應來減低ΔEST來探討與有無熱活化延遲螢光(Thermally activated delayed fluorescence, TADF)。所有的材料皆有良好的熱穩定性質，熱裂解溫度皆在400 oC以上，並且進一步的將此系列衍生物(材料)應用於有機發光二極體的元件上面來探討是否有TADF材料的效率標準，我們以NPB (20)/TAPC (30)/mCP:10wt%Dopant (30)/PPT (10)/TmPyPB (70)(unit: nm)做為元件最佳化的結構將所有材料製作成元件比較使用更強電子予體的材料DMACAZB，其元件電激發光光譜波峰位於470 nm、CIE為(0.14, 0.19)，EQE達到21.7 %具有良好的效率，最大亮度可達10730 cd/m2，此材料經暫態螢光光譜儀確認為熱活化延遲螢光(TADF)材料其延遲螢光的生命期為108.2 us,材料PXZAZB由於phenoxazine極強的電子給予能力造成了EL紅位移至512 nm，但是也將ΔEST最小化至0.08 ev，在元件的應用之中達到了近乎延遲螢光EQE上限的30.3 %，並且無套用增加出光率的結構，CIE位於(0.26, 0.57)，而進一步的由暫態激發螢光光譜確定其生命期為25.2 us屬於延遲螢光材料。

Thermally activated delayed-fluorescence (TADF) are important in OLED display and lighting, particularly on high performance deep blue dopants in fluorescent OLED are still challenging. In this contest, we design a new series of 1,4-azaborine derivatives such as CZAZB, tCZAZB, tmCZAZB, SpiroAZB, DMACAZB and PXZAZB were synthesized. Further, we reduced the triplet and singlet energy gap between donor and acceptor such as ΔEST are 0.37, 0.26, 0.22, 0.21, 0.11, 0.08 eV respectively for the above compounds. All of the material has high Td above 400 oC showing good thermal stability. Furthermore, among the six 1,4-azaborine materials DMACAZB and PXZAZB shows better external quantum efficiencies for the deep blue and green fluorescence emitter. We applied all of the materials into OLEDs, following the optimized device structure: NPB (20)/TAPC (30)/mCP:10wt%Dopant (30)/PPT (10)/TmPyPB (70) (unit: nm)

DMACAZB achieved high EQE in 21.7 %, and high luminance of 10730 cd/m2, and showed blue CIE (0.14, 0.19), further we confirmed that TADF property of this compound by Transient Pl instrument, τdelayed was 108.2 us.

PXZAZB showed most red shift to 512 nm in EL spectra, due to the strong electron donating by phenoxazine, but also minimized the ΔEST into 0.08 ev, also showing the extremely high EQE in 30.3 %, which closed to the maximum EQE of TADF material without considered light out property, and CIE at (0.26, 0.57), we confirmed the TADF component with Transient PL, τdelayed decreased to 25.5 us, because the short delayed time the EQE increase.

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第三章
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