根基於可乾、濕式製作磷光綠光染料且具有效率滾升特性之有機發光二極體

A Wet- and Dry- Processable Phosphorescent Green Dye Based Organic Light-Emitting Diodes with Roll-up Efficiency

丁子鈺(Tzu-Yu Ting)

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)

https://doi.org/10.6843/NTHU.2012.00005

摘要

本研究發表一可乾式及濕式製作之新穎綠磷光材料bis[5-methyl-8-trifluoromethyl-5H-benzo(c)(1,5)naphthyridin-6-one]iridium(picolinate) (3-CF3BNO) ，其材料特性有著短激態生命期 (0.39 μs) 及相對高量子產率 (74%) ，其利用濕式製程所製備之綠光Organic light-emitting diode (OLED)，其搭配主體材料3,5-di(9H-carbazol-9-yl) tetraphenylsilane (SimCP2) 當亮度在100 cd/m2下時為52 lm/W 外部量子產率為18%，而亮度在1000 cd/m2下為61 lm/W外部量子產率為23%，此元件能量效率隨著亮度提高而有能量效率上升的現象產生，且此元件顯著的高效率同時也是綠光元件在濕式製程中的能量效率世界記錄；而3-CF3BNO在乾式製程所製備之綠光OLED其搭配主體材料CBP，當亮度在1000 cd/m2下為59 lm/W，而使用習知的綠磷光染料tris(2-phenylpyridine) iridium(III) [Ir(ppy)3]搭配相同元件結構，在1000 cd/m2下為25 lm/W。這些結果證明使用此綠磷光染料3-CF3BNO，不管元件是乾式製程或者是濕式製程製作，利用適當的元件結構和傳輸層材料搭配皆具有製備出高效率OLED元件的潛力 。

關鍵字

綠磷光染料 ； 效率滾升

並列摘要

We demonstrate in this report a novel wet- and dry-process feasible green bis[5-methyl-8-trifluoromethyl-5H-benzo(c)(1,5)naphthyridin-6- one]iridium(picolinate) (3-CF3BNO) containing Organic light-emitting diode (OLED) device with an efficacy roll-up character. The newly synthesized iridium complex exhibits a relatively short excited-state lifetime (0.39 μs) and a high quantum yield of 74%, both which warrant this complex to be a highly electroluminescence active candidate as long as a proper device structure is coupled.
The wet processed device using a 3,5-di(9H-carbazol-9-yl) tetraphenylsilane (SimCP2) host, for example, shows a 52 lm/W with an 18% external quantum efficiency (EQE) at 100 cd/m2, which increases to 61 lm/W with a 23% EQE at 1,000 cd/m2, the highest among all reported wet-processed green OLEDs. Based on the same device structure, the green tris(2-phenylpyridine) iridium(III) (Ir(ppy)3) containing counterpart exhibits only a 12 lm/W with a 6% EQE at 1,000 cd/m2. For the dry-processed device using a 4,4-bis(carbazol-9-yl)biphenyl (CBP) host, it is 59 lm/W with a 25% EQE at 1,000 cd/m2, while the counterpart of the green Ir(ppy)3 exhibits only 25 lm/W with a 5% EQE. These comparisons also demonstrate this green 3-CF3BNO emitter to possess a potential to yield an even higher device efficacy provided more appropriate hosting, co-hosting, carrier transporting, and/or carrier confining materials are employed.

並列關鍵字

HASH(0x9db1428) ； HASH(0x9db14a0)

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