- 學位論文
根基於可濕製銥錯合物黃光OLED
Solution-Process Feasible Iridium Complex Based Yellow OLED
摘要
黃光在顯示和照明的應用中扮演了關鍵的角色，其可應於高品質RGBY顯示器和生理友善的低色溫照明的製作；對於有機發光二極體(Organic Light Emitting Diode, OLED)技術而言，連續滾印可應用於製作低成本大面積的元件；研發出一個具有可濕製特性的高效率黃光染料，便成重要；因此，本研究利用一新穎黃色磷光含銥錯合物bis[5-methyl-7-fluoro-8-trifluoromethyl-5H-benzo(c)(1,5)naphthyridin -6-one]iridium (picolinate) (FCF3BNO)，探討其濕製的可行性；所得元件，在亮度為1,000 cd/m2時，其能量效率為49.2 lm/W，外部量子效率為22.7%；若將此黃光和美國國家電視標準委員會（NTSC）所制訂之標準紅綠藍光配合應用，則其色彩飽和度可達110%；此一元件的高效率，可歸因於利用了氟原子及三氟甲基來取代發光染料上的氫原子，進而改變分子間緻密的堆疊方式，以減少染料間的自我焠熄；本研究亦發現，在良好的主客體能階搭配下，可使激子更有效地注入，使載子注入平衡，進而使元件達到高效率；此外，在加入此一黃光後所得到的四波段純白光6,000K，從視網膜保護視的角度來看，比典型的三波段純白光更友善8％，從褪黑激素分泌的角度來看，也是更友善8％。
並列摘要
Yellow emission plays an important role in many display and lighting applications, such as RGBY display or blue hazard free lighting sources, while wet-process enables soft devices to be manufactured cost-effectively. We demonstrate here that high efficiency yellow organic light-emitting diodes can be made with an innovative solution-process viable iridium based material bis[5-methyl-7-fluoro-8- trifluoromethyl-5H-benzo(c)(1,5)naphthyridin-6-one]iridium (picolinate) (FCF3BNO). The device exhibits a power efficacy of 49.2 lm W-1 at 1,000 cd m-2 with an external quantum efficiency of 22.7% with a spin-coated emissive layer. A National Television Standards Committee (NTSC) of 110% is achievable by employing the yellow emission along with the standard RGB. The high efficiency may be attributed to the electron-withdrawing F and CF3 substitutions in the emitter to prevent self-quenching from dense packing. We also found that high efficient can be achieved for wet-processed devices simply by balancing the injected holes and electrons with the help of energy-level matching hosts. The resultant RGBY composing pure white light is 8% more friendly than the typical RGB counterpart from retina protection perspective and also 8% better for melatonin secretion.