藍色磷光有機發光二極體暫態機制與有機薄膜製作 於矽基板之研究

Abstract

本篇論文的研究方向為藍色磷光有機發光二極體的暫態行為及有機薄膜裡的激子機制。 在第三章中，我們探討以不同的主體材料的藍色磷光有機二極體的載子機制。研究的材料主要有三個，分別為電洞傳輸型材料1,3-Bis(N-carbazolyl)benzene(mCP)， 電子傳輸型材料3-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole(TAZ)及雙極性材料9,9'-(2-(4,5-diphenyl-4H-1,2,4-triazol-3-yl)-1,3-phenyle -ne)bis(9H-carbazole)(CbzTAZ)，我們以不同的負偏壓、驅動頻率、驅動時間、負偏壓波形去探討暫態的載子行為。藉由不同的突波 (spike) 面積及載子壽命可以了解到不同主體材料的電荷捕捉行為 (carrier-trapping). 第四章的主要探討5,6,11,12-tetraphenylnaphthacene (rubrene) 有機薄膜激子被矽基板猝熄之行為，我們分別量測溶液態及薄膜態在不同機板上(矽及石英玻璃)的穩態光譜、吸收及暫態螢光壽命量測，我們可以量測到瞬時螢光及單態分裂所造成的延遲螢光，藉由這些資訊了解在有機薄膜中激子中動態行為，例如單態分裂(singlet fission)。 關鍵字:有機發光二極體、暫態電致放光、激子分裂

There are two research topics in this thesis. The first topic is transient behavior of blue phosphorescent organic light-emitting diode(PhOLED). The second topic is exciton dynamic in organic thin film. In chapter 3, we studied the carrier dynamic of blue PhOLED with different host materials. The three material included p-type material 1,3-Bis(N-carbazolyl)benzene (mCP), n-type 3-(biphenyl-4-yl)-5-(4-tert- butylphenyl)-4-phenyl-4H-1,2,4-triazole (TAZ) and bipolar material 9,9'-(2-(4,5-diphen yl- 4H-1,2,4-triazol-3-yl)-1,3-phenylene)bis(9H-carb -azole)(CbzTAZ). We used waveforms with different reverse bias, driving frequency and driving time to investigate the transient behavior. By the different spike area and carrier lifetime, we could understand the carrier-trapping mechanism in different host material. Exciton quenching of 5,6,11,12-tetraphenylnaphthacene (rubrene) thin film by silicon substrate was studied in chapter 4. We measured the steady-state spectroscopy of solution, thin film on quartz, and silicon substrate. Besides, by time-resolved photoluminescence, we could understand the exciton dynamic via prompt fluorescence and delayed fluorescence.