磷光共軛高分子發光二極體之高效率綠光及高演色性白光多層結構設計

Design of highly efficient green and broad-band white multilayer phosphorescent polymer-based light-emitting diode

湯凱智(Kai-Chin Tang)

指導教授 ： 洪勝富教授 ； 孟心飛教授

國立清華大學/電機資訊學院/電子工程研究所/碩士(2007年)

https://doi.org/10.6843/NTHU.2007.00185

摘要

利用PVK((poly(vinylcarbazole))當作主體以及兩種或三種銦金屬錯合物使用單層或多層結構來製作高效率的磷光PLED元件是本論文討論的重點。使用Ir(mppy)3((Tris-(2-4(4-toltyl) phenylpyridine))此種高效率的綠光並以旋轉潤濕的技術來塗佈電洞傳輸層TFB(poly (9, 9’-dioctylfluorene-co-N-(4-butylphenyl) diphenylamine))後可以得到效率達48cd/A的綠光LED元件。加入了紅光銦錯合物Ir(piq)2((1-phenylisoquinoline)(acetylacetonate)iridium(III))後可以得到高達23cd/A的效率並且有從500nm延伸到720nm的寬的放射光譜。在製作白光LED時利用FIrpic ((III) bis[(4,-6-di-fluorophenyl-pyridinato)N,C2]picolinate))參雜在PVK主體中以直接旋轉塗佈的方式當成第二層的發光層來完成白光元件。其涵蓋三色光所組成的白光效率達到8.1cd/A。當第二層發光層改為PFO ((Poly (9, 9-dioctylfluorene))後可得到高演色性係數86的白光光譜。最高效率為5.7cd/A而最高亮度為8900cd/m2。在此結構下紅光和綠光相對的質量比對於第二層藍光層加入後有著明顯的影響。

關鍵字

PLED ； 磷光 ； 白光 ； 多層結構 ； 高效率

並列摘要

Efficient phosphorescent polymer light-emitting diode with
poly(vinylcarbazole) (PVK) doped by two or three iridium complexes in single and bilayer structures are studied. Using spin-rinsed methode for the device, the efficiency for Ir(mppy)3 (Tris-(2-4(4-toltyl) phenylpyridine)
device can reach to 48cd/A. With (Ir(mppy)3) as the green emitter and (1-phenylisoquinoline) (acetylacetonate) iridium (III) (Ir(piq)2) as the red emitter the efficiency is as high as 23 cd/A with broad band emission from 500 nm to 720 nm. For white emission a second layer is added with blue emitter ((III) bis [(4,-6-di-fluorophenyl-pyridinato)N,C2] picolinate) (FIrpic) doped in PVK. White light containing three spectral peaks results with efficiency 8.1 cd/A. As the second blue layer is replaced by the fluorescent (Poly (9, 9-dioctylfluorene)) (PFO) white emission with high color rendering index 86 is achieved. The efficiency is 5.7 cd/A with peak luminance 8900 cd/m2. For a given iridium complexes ratio the relative intensity of the green and red emission depends sensitively on the second blue layer.

並列關鍵字

PLED ； phosphorescent ； white ； multilayer ； high efficiency

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