高效率及白光有機高分子電激發光元件

High Efficiency and White Light Organic Polymer Light-Emitting Device

彭康峻(Kang-Chun Peng)

指導教授 ： 李君浩

共同指導教授 ： 梁文傑(Man-Kit Leung)

國立臺灣大學/電機資訊學院/光電工程學研究所/碩士(2005年)

https://doi.org/10.6342/NTU.2005.00612

摘要

在本論文中，我們首先使用triton來修飾PEDOT：PSS。在我們的高分子電激發光元件中，PEDOT：PSS作用為一電洞注入層。因為triton是一種介面活性劑，所以它可以改善界面間的附著並且使PEDOT和PSS更均勻的分散在水溶液中。如此一來可增加PEDOT：PSS的導電度並且增加電洞注入來提高元件效率。接著我們使用一新的發光材料為發光層製作高分子電激發光元件。為了提高元件的效率，我們使用BCP作一電洞阻擋層，Alq3作一電子傳輸層和新的高分子材料(OPV-IPDI)作一電洞傳輸層，這樣的結構與只有PEDOT：PSS的元件相比可以提高六倍的電流效率。更進一步的，我們將PEDOT：PSS作一電洞注入層，OPV-IPDI和它的衍生高分子(OPV-OXD，OXD-IPDI和OPV-Si)作電洞傳輸層應用在小分子電激發光元件上。與使用傳統電洞傳輸材料NPB的元件相比，使用新的高分子材料(OPV-IPDI和OPV-OXD)製作的元件可以降低約兩伏的驅動電壓並且改善元件的電流效率達至兩倍以上。
另一方面，靠著一個簡單的旋塗製程，我們旋塗高分子發光材料MEHPPV於高效率藍光小分子電激發光元件的出光面上。藉由光轉換原理，我們成功的製作發出純白光(0.323,0.329)的元件。在10 mA/cm2的操作電流下，此白光元件的白光演色指數為71.1，流明效率為10.1 lm/W。

關鍵字

有機 ； 發光 ； 高分子 ； 白光

並列摘要

In this thesis, we use triton to modify PEDOT:PSS which is used as the hole injection in our PLED device. Because triton is a kind of interface active solvent, it can improve the adhesion of the interface, and make PEDOT and PSS disperse uniformly in water solution. That can raise the conductivity and help hole-injection capability to improve device efficiency. Then we use a new light-emitting material (P1) as the emitting layer in PLEDs. To improve device performance, we use BCP as the hole blocking layer, Alq3 as the electron transport layer and the new polymer material (OPV-IPDI) as the hole transport layer, which can improve the efficiency by six times compared to the control device Furthermore, we apply PEDOT:PSS, OPV-IPDI and its derivatives (OPV-OXD, OXD-IPDI, and OPV-Si) as the hole injection and transport layers respectively in small molecule OLEDs. Compared with the conventioanl hole transport material, we demonstrate our new hole transport materials (OPV-IPDI and OPV-OXD) can effectively reduce the driving voltage by 2V and improve the current efficiency more than twice.
On the other hand, by using a simple spin-coating process, we spin polymer luminescent material MEHPPV on the emitting side of the high efficiency blue small molecule OLED. Based on luminescence conversion mechanism, we successfully fabricate a pure white light (0.323, 0.329) device based on a high efficiency blue small molecule OLED. The white light device has color rendering index of 71.1 and the luminous efficiency of 10.1 lm/W at 10 mA/cm2.

並列關鍵字

organic ； light ； emitting ； white light ； polymer

參考文獻

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