藍色有機螢光發光材料發光效率最好的應屬Idemitsu 公司開發的
Stylbene 系列衍生物，但在實際的產品操作蒸鍍時，發現材料會有熱裂解的
現象，以致於會影響產品的良率。
因此我們重新設計一種耐熱性較佳，螢光量子效率又高的材料，來改善
材料壽命問題，我們選定以Pyrene 為材料分子的主架構，因為此類分子較具
有剛性，螢光量子效率高，非常適合用來作為藍色發光材料。此類Pyrene
衍生物的合成比較簡單，產物的耐熱性(Tm~295.66℃)比Stylbene 衍生物
(Tm~240.67℃)高出約55℃，Pyrene 衍生物鍍膜溫度(280℃)也較Stylbene
衍生物(335℃)低，從元件實驗结果知道，Pyrene 衍生物元件，搭配適當的
主發光體在6V 與10000nits 下的壽命100hr 較Stylbene 衍生物20hr 提高
約5 倍、發光效率6.5cd/A 提高到9.9cd/A，提高約1.5 倍。
我們利用甲基(-CH3)來提高推電子效果，藉由調整其在苯環上不同位置
來調整材料發光顏色，此系列產品目前可適用於水藍色系列的藍光材料。
另外，除了發光材料會影響元件壽命與發光效率外，從實驗结果發現
膜層間HOMO/LUMO 的組合與安排、從陽極(ITO)到電洞傳輸層(HTL)間HOMO
的組合也會影響元件壽命，若多加一層HIL 層則可改善元件壽命。

The best efficiency blue dopant emitting material should belong to Stylbene
derivatives manufactured from Idemitsu company﹒But actually﹐we found which
will decompose easily after thin film evaporation that affected the yield rate of
OLED product﹒
So we designed a material possessed better thermal property and high quantum
efficiency to improve lifetime issues﹒We select Pyrene molecular as the phosphor
core which also get more rigid molecular property and high quantum efficiency ﹐
it is suitable as the blue dopant material﹒Pyrene derivative are easier to synthesize﹒
The thermal property (Tm~295.66℃) is 55℃ higher than stylbene
derivative(Tm~240.67℃) and the thin film evaporation temperature(280℃) is
lower than stylbene derivative (335℃)﹒We can verify a good result from
experiment﹐ Pyrene derivative device under 6V and 10000nits﹐the lifetime of
Pyrene was improved 5 times to 100hrs longer compared with that of stylbene
derivative﹒The efficiency was also improved 1.5 times from 6.5cd/A to 9.9 cd/A﹒
We take the advantage of methyl(-CH3) donor effect by different position on
benzene to adjust material’s emitting CIEx,y﹐ Such a Pyrene derivative can be
applied to blue emitting materials﹒
We can conclude some factors from our experiments which influence the device
lifetime and efficiency performance﹒ They are
(1). Emitting material of thermal property﹒
(2). HOMO/LUMO arrangement between thin film﹒
(3). The difference of HOMO value between ITO to HTL﹒(If insert a lower
HOMO layer of HIL to ITO & HTL which can improve lifetime of device as
well﹒)

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