具電荷控制層與摻雜紅色螢光材料之白光有機發光二極體研究

The study of white organic light-emitting diodes with the charge control layer and a red fluorescent dopant

吳悠雋(Yu-Chun Wu)

指導教授 ： 蘇水祥 ； 橫山明聰

義守大學/電機資訊學院/電子工程學系/碩士(2015年)

https://doi.org/10.6343/ISU.2015.00285

摘要

本研究摻雜藍色磷光銥錯合物iridium(III)bis[(4,6-di-fluorophenyl)-pyridinato-N,C2'] (FIrpic)以及紅色螢光材料4-(dicyanomethylene)-2-tert-buty1-6(1,1,7,7tetramethyljulolidy1-9-enyl)-4H-pyran (DCJTB) 於小分子磷光主體N, N_-dicarbazolyl-3, 5-benzene (mCP)，因FIrpic之EL(electroluminescence)頻譜波峰位於472 nm，DCJTB之EL頻譜波峰位於627 nm，利用此雙發光層製作出白光磷光有機發光二極體(white PHOLED)，並於元件結構內插入電荷控制層，提升白光磷光有機發光二極體之發光效率。探討螢光客體材料之最佳摻雜濃度以及其結構上加入電荷控制層後載子的傳輸機制，進而研究雙發光層厚度比例對於元件特性的影響。
實驗結果顯示在DCJTB摻雜濃度為1wt%，電荷控制層厚度為1nm，獲得趨近標準白光CIE色度座標的白光磷光有機發光二極體元件，元件具極佳的色穩定性，並且元件的效率及亮度皆提高；電壓變動時其CIE變化值為(±0.01，±0.01)，元件在驅動電壓6V時，最佳效率12.12 cd/A，此時CIE座標為(0.33，0.39)，此元件的最大發光亮度為7100 cd/m2。

關鍵字

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並列摘要

In this paper, we dope blue phosphorescent iridium complexes iridium(III)bis[(4,6-di-fluorophenyl)-pyridinato-N,C2'] (FIrpic) and red fluorescent material 4-(dicyanomethylene)-2-tert-buty1-6(1,1,7,7tetramethyljulolidy1-9-enyl)-4H-pyran (DCJTB) into the small molecular phosphorescent host N, N_-dicarbazolyl-3, 5-benzene (mCP) as double emitting layer (EML) to fabricate white phosphorescent organic light-emitting diodes (PHOLEDs) owing to the peaks of FIrpic and DCJTB electroluminescent (EL) spectrum located at 472 nm and 627 nm, respectively. Device was inserted a charge control layer (CCL) into the emitting layer to improve device current efficiency. The doping concentration of the guest material is optimized and the carrier transporting mechanism of CCL is discussed. Afterward, the thickness of each EML is modified to observe the luminous characteristics.
Experimental results reveal that the optimized doping concentration of DCJTB was 1 wt% and the thickness of CCL was 1 nm. The white PHOLED has enhanced current efficiency and luminescence and shows excellent color stability which is close to standard CIE chromaticity coordinates of white light. The CIE coordinates vary within (±0.01, ±0.01). When driving voltage was 6 V, the optimized device demonstrated the maximum luminous efficiency of 12.12 cd/A, luminance of 7100 cd/m2, and CIE chromaticity coordinates of (0.33, 0.39).

並列關鍵字

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參考文獻

[1]. J. Z. Zhu, W. L. Li, and B. Chua, “Non-doped-type white organic light-emitting diodes for lighting purpose”, Appl. Phys. Lett., vol. 130, p. 865 (2010).

[2]. Y. Fukuda, T. Watanabe, and T. Wakimoto, “An organic LED display exhibiting pure RGB colors’’, Synth. Met., vol. 111, p. 111 (2000).

[3]. C. D. Müller, A. Falcou, and N. Reckefuss, “Multi-colour organic light-emitting displays by solution processing”, Nature, vol. 421, p. 829 (2003).

[4]. Y. Xiong, W. Xu, C. Li, “Utilizing white OLED for full color reproduction in flat panel display”, Org. Electron, vol. 9, p. 533 (2008).

[5]. B. D, Andrade, and J. J. Brown, “White phosphorescent organic light emitting devices for display applications”, Proc. Article, vol. 6225, p. 622514 (2006).