旋塗小分子主體製備高效率磷黃光有機發光二極體

Fabrication of Highly efficient yellow organic light-emitting diode with a molecular host-based solution-processed emissive layer

姜政熠

指導教授 ： 周卓煇

國立清華大學/工學院/材料科學工程學系/碩士(2012年)

摘要

本研究利用旋塗小分子主體，製備高效率磷黃光有機發光二極體，並有效提升濕式製作磷黃光元件的效率，此元件效率表現，在亮度100 cd/m2下，能量效率為32 lm/W，相較於先前濕式製作高分子主體能量效率為15 lm/W的紀錄，有113%的改善；此元件獲得高效率的原因為：CBP主體摻雜PO-01磷黃光染料，在電子注入層與發光層間，無電子注入能障；利用適當的主客體能階搭配，使激子在主體上產生，藉由主客體能量傳遞，將能量給客體放光。將此元件貼上微透鏡(micro-lens)作為外部出光擷取後，在100 cd/m2 , 1,000, 10,000 cd/m2下，能量效率進一步提升至53, 39和14 lm/W。本研究對濕式製作發光層的有機發光二極體之高效率的結構設計，有極大的貢獻。

關鍵字

有機發光二極體 ； 高效率黃光 ； 濕式製作

並列摘要

Highly efficient yellow organic light-emitting diodes (OLEDs) with a solution-process feasible emissive layer were fabricated by simply using molecular hosts doped with an iridium-complex based yellow emitter. The best yellow OLED device studied here showed, at 100 cd/m2 for example, a power efficiency of 32 lm/W, a 113% improvement as comparing with the prior record, 15 lm/W, by using a polymeric host.
The marked efficiency improvement may be attributed to the device that composed an electron-injection-barrier free architecture, the device structure that led the excitons to generate preferably on host to enable the efficiency-effective host-to-guest energy transfer to occur, and the employed molecular host that exhibited a good host-to-guest energy transfer. The efficiency was further improved to 53, 39 and 14 lm/W at 100, 1,000 and 10,000 cd/m2, respectively, with the use of a micro-lens. This study demonstrates also the possibility of achieving relatively high device efficiency for wet-processed OLED devices via balancing the injection of carriers, though based on commercially available OLED materials and limited design alternatives in device structure.

並列關鍵字

OLED ； yellow ； carrier injection balance

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