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Proceedings Paper

Two stacked tandem white organic light-emitting diodes employing WO3 as a charge generation layer
Author(s): Jong-Kwan Bin; Na Yeon Lee; SeungJae Lee; Bomin Seo; JoongHwan Yang; Jinook Kim; Soo Young Yoon; InByeong Kang
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Paper Abstract

Recently, many studies have been conducted to improve the electroluminescence (EL) performance of organic lightemitting diodes (OLEDs) by using appropriate organic or inorganic materials as charge generation layer (CGL) for their application such as full color displays, backlight units, and general lighting source. In a stacked tandem white organic light-emitting diodes (WOLEDs), a few emitting units are electrically interconnected by a CGL, which plays the role of generating charge carriers, and then facilitate the injection of it into adjacent emitting units. In the present study, twostacked WOLEDs were fabricated by using tungsten oxide (WO3) as inorganic charge generation layer and 1,4,5,8,9,11- hexaazatriphenylene hexacarbonitrile (HAT-CN) as organic charge generation layer (P-CGL). Organic P-CGL materials were used due to their ease of use in OLED fabrication as compared to their inorganic counterparts. To obtain high efficiency, we demonstrate two-stacked tandem WOLEDs as follows: ITO/HIL/HTL/HTL′/B-EML/ETL/N-CGL/P-CGL (WO3 or HAT-CN)/HTL″/YG-EML/ETL/LiF/Al. The tandem devices with blue- and yellow-green emitting layers were sensitive to the thickness of an adjacent layer, hole transporting layer for the YG emitting layer. The WOLEDs containing the WO3 as charge generation layer reach a higher power efficiency of 19.1 lm/W and the current efficiency of 51.2 cd/A with the white color coordinate of (0.316, 0.318) than the power efficiency of 13.9 lm/W, and the current efficiency of 43.7 cd/A for organic CGL, HAT-CN at 10 mA/cm2, respectively. This performance with inserting WO3 as CGL exhibited the highest performance with excellent CIE color coordinates in the two-stacked tandem OLEDs.

Paper Details

Date Published: 23 September 2016
PDF: 8 pages
Proc. SPIE 9941, Organic Light Emitting Materials and Devices XX, 99411T (23 September 2016); doi: 10.1117/12.2236438
Show Author Affiliations
Jong-Kwan Bin, LG Display (Korea, Republic of)
Na Yeon Lee, LG Display (Korea, Republic of)
SeungJae Lee, LG Display (Korea, Republic of)
Bomin Seo, LG Display (Korea, Republic of)
JoongHwan Yang, LG Display (Korea, Republic of)
Jinook Kim, LG Display (Korea, Republic of)
Soo Young Yoon, LG Display (Korea, Republic of)
InByeong Kang, LG Display (Korea, Republic of)


Published in SPIE Proceedings Vol. 9941:
Organic Light Emitting Materials and Devices XX
Franky So; Chihaya Adachi; Jang-Joo Kim, Editor(s)

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