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24 September 2018 Lifetime extension for organic light emitting diodes
Fuh-Shyang Juang, Lin Kuo, Yen-Hua Lin, Ding-Wen Zhang, Yu-Sheng Tsai
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Proceedings Volume 10736, Organic Light Emitting Materials and Devices XXII; 107361M (2018) https://doi.org/10.1117/12.2320027
Event: SPIE Organic Photonics + Electronics, 2018, San Diego, California, United States
Abstract
In this paper, we adopt solution/evaporation hybrid processes to fabricate white organic light emitting diodes (WOLED) with a light-emitting area of 1.5 cm * 1.5 cm. The hole injection layer (PEDOT:PSS), p-type doped hole transport layer (NPB:F4-TCNQ), and emitting layer (UBH-215:UBD-07:DBP) are coated using the solution process while the electron transport layer (TPBI), LiF, and Al are coated through vacuum thermal evaporation. The light-emitting layer is a fluorescent material (UBH-215 as host) that combines the blue fluorescent material UBD-07 and the red fluorescent material DBP for a dual band light-emitting diodes. We found that if the red DBP doping concentration is too high, the overall emitting color tends toward reddish, and the luminance efficiency decreases. For WOLEDs whose red DBP doping concentration is 0.25%, the luminance reaches 192 cd/m2, and the current efficiency 0.94 cd/A at 9V voltage.

Introducing a hole injection layer between the ITO and emitting layer can enhance both the luminance and efficiency of a WOLED. In addition to the hole injection layer, it is found that inserting p-type doped HTL (NPB:F4-TCNQ) between HIL and EML using the spin- coating method can also improve luminance and efficiency. Furthermore, by optimizing and adjusting the dopant ratio and thickness of p-type doped HTL, the luminance reaches 393.1 cd/m2, the current efficiency reaches 1.32 cd/A under 9V voltage, and the OLED lifetime (half-value period) increases from the original 0.8 hours to 2 hours.
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Fuh-Shyang Juang, Lin Kuo, Yen-Hua Lin, Ding-Wen Zhang, and Yu-Sheng Tsai "Lifetime extension for organic light emitting diodes", Proc. SPIE 10736, Organic Light Emitting Materials and Devices XXII, 107361M (24 September 2018); https://doi.org/10.1117/12.2320027
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KEYWORDS
Organic light emitting diodes
Doping
Coating
Electro optics
Laser induced fluorescence
Manufacturing
Fluorescent materials
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