Journal of Industrial and Engineering Chemistry, Vol.15, No.3, 420-422, May, 2009
Color stability and suppressed efficiency roll-off in white organic light-emitting diodes through management of interlayer and host properties
E-mail:
Color stability and efficiency roll-off of white light-emitting diodes (WOLEDs) with blue fluorescent and red phosphorescent emitting materials were manipulated by controlling the charge transport properties of interlayer and triplet host materials. A pure white emission was observed in WOLEDs with a bipolar interlayer and a hole transport type triplet host material. A white color coordinate of (0.31, 0.35) and a current efficiency of 14.4 cd/A were obtained. In addition, color index of WOLEDs could be kept stable up to a high luminance of 10,000 cd/m2 and an efficiency roll-off was also suppressed.
- Sun Y, Giebink NC, Kanno H, Ma BW, Thompson ME, Forrest SR, Nature, 440, 908 (2006)
- Schwartz G, Reineke S, Walzer K, Leo K, Appl. Phys. Lett., 92, 053311 (2008)
- Ho C, Lin M, Wong W, Wong W, Chen CH, Appl. Phys. Lett., 92, 083601 (2008)
- Kanno H, Giebink NC, Sun Y, Forrest SR, Appl. Phys. Lett., 89, 023503 (2006)
- Lin MF, Wang L, Wong WK, Cheah KW, Tam HL, Lee MT, Ho MH, Chen CH, Appl. Phys. Lett., 91, 073517 (2007)
- Shih PI, Shu CF, Tung YL, Chi Y, Appl. Phys. Lett., 88, 251110 (2006)
- Kanno H, Sun Y, Forrest SR, Appl. Phys. Lett., 86, 263502 (2005)
- Kanno H, Holmes RJ, Sun Y, Kena-Cohen S, Forrest SR, Adv. Mater., 18(3), 339 (2006)
- Kim SH, Jang J, Lee JY, Appl. Phys. Lett., 91, 123509 (2007)