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Proceedings Paper

High efficiency green phosphorescent OLEDs with long lifetime by using novel host material
Author(s): Eun-Sun Yu; Nam-Soo Kim; Young-Hoon Kim; Eui-Su Kang; Mi-Young Chae; Tu-Won Chang
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Paper Abstract

We developed a novel host material, CheilGH-01 reinforced with electron transporting property to perform high luminance efficiency and low driving voltage with long lifetime in green phosphorescent OLED without HBL (hole blocking layer). The device with a structure of ITO/NPB/TCTA/Host:Ir(ppy)3/Balq/Alq3/Liq/Al using CheilGH-01 as a host showed better performance than the device with CBP as a host; At luminance of 1000 cd/m2, driving voltages, current efficiencies and power efficiencies are 5.4 V, 60 cd/A and 35 lm/W for CheilGH-01 and 7.2 V, 42 cd/A and 18.8 lm/W for CBP. It takes 240 hours for CheilGH-01 and 177 hours for CBP from the initial luminance of 3000 cd/m2 to the luminance of 1500 cd/m2 (55% of the initial). In the case of device with a structure of ITO/NPB/TCTA /Host:Ir(ppy)3/Alq3/Liq/Al, CheilGH-01 showed 300% enhancement in luminance efficiency and more than 800% longer lifetime than CBP; At luminance of 1000 cd/m2, driving voltages, current efficiencies and power efficiencies are 6.3 V, 51 cd/A and 26 lm/W for CheilGH-01 and 8.6 V, 21 cd/A and 7.8 lm/W for CBP. It takes 411 hours for CheilGH-01 and 82 hours for CBP from the initial luminance of 3000 cd/m2 to the luminance of 1500 cd/m2. By using our novel host material, we are able to eliminate HBL from the conventional green phosphorescent OLED and still provide OLED with longer lifetime and excellent luminance efficiency.

Paper Details

Date Published: 2 September 2008
PDF: 8 pages
Proc. SPIE 7051, Organic Light Emitting Materials and Devices XII, 70511O (2 September 2008); doi: 10.1117/12.794520
Show Author Affiliations
Eun-Sun Yu, Cheil Industries Inc. (South Korea)
Nam-Soo Kim, Cheil Industries Inc. (South Korea)
Young-Hoon Kim, Cheil Industries Inc. (South Korea)
Eui-Su Kang, Cheil Industries Inc. (South Korea)
Mi-Young Chae, Cheil Industries Inc. (South Korea)
Tu-Won Chang, Cheil Industries Inc. (South Korea)


Published in SPIE Proceedings Vol. 7051:
Organic Light Emitting Materials and Devices XII
Franky So; Chihaya Adachi, Editor(s)

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