|a有機發光材料應用於固態照明與醫用器材中的價值蒸蒸日上。為了做出比本實驗室已發表的藍綠光分子 dpra (圖一) 放光更飽和更藍的分子，期望其有更大的能隙來作為主體材料，便能有效地包覆客體材料與進行電荷傳輸；或作為效率更高的藍綠光客體材料，因此本研究做了一系列的探討。在初期文獻中，為了使分子放光藍移，經常在 C^N ligand上增加拉電子基團，使整體的最高佔據電子軌域 (highest occupied molecular orbital, HOMO) 更深，或在 N^N ligand 上增加推電子基團，使整體的最低未占據電子軌域 (lowest unoccupied molecular orbital, LUMO) 往上移動，使得分子的能階差 (energy gap, Eg) 擴大，進而達到藍移的目的。在近幾年的文獻中，提及當分子與分子間越扭曲，或是縮短分子的共軛系統，例如：使用共軛系統較小的芳香基團，便能使分子藍移。而為使分子之間的更加扭曲，經常使用能增加立體障礙的脂肪族，其不僅不會增加分子的共軛系統，反而使分子更為扭曲，且縮短共軛系統。但有文獻指出，雖然脂肪族可以使分子藍移，但是在效率上卻不是那麼理想，是由於脂肪族在元件中，會阻饒電子的傳遞，進而使整體元件效率大幅下降。本研究主要探討合成出高效率藍光的離子型銥金屬錯合物，並且成功合成出 EQE 達 10.97 % 的高效率的綠光分子並利用在(light-emitting electrochemical cells, LECs) 上。|uIn order to make molecules that are bluer than those published in the laboratory before dpra (Figure 1) can effectively coat guest materials and carry out charge transfer, as well as more effective green. In the initial literature, in order to make the molecule blue shift, the electron withdrawing group was often added to the C^N ligand to make the overall HOMO move down or the electron pushing group was added to the N^N ligand to make the overall LUMO moves upward to expand the Eg to the point of blue shift. In recent years, it is mentioned in the literature that the twist between molecules is used to shorten the conjugation of molecules. The system makes the molecule blue-shift or chooses a smaller conjugated system to replace the aromatics. However, to make the distortion between molecules often use non-aromatics and provide steric barriers, not only does not increase the molecular conjugated system, but the molecules More distortion shortens the conjugated system, but some literature points out that although aliphatic can make the molecule blue shift, the efficiency is not so ideal. The aliphatic group of electrons in the device cannot pass on the electrons and hinders the electron transfer, which greatly reduces the overall device efficiency. This paper mainly discusses the synthesis of high-efficiency deep blue ionic iridium metal molecules, and we successfully synthesized high-efficiency green The light molecule and EQE reaches 11% and is used in LECs.
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