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http://dx.doi.org/10.4313/JKEM.2007.20.1.053

Electrical and Optical Characteristics of White OLEDs with a Rubrene doped Layer  

Moon, Dae-Gyu (순천향대학교 신소재공학과)
Lee, Chan-Jae (전자부품연구원 디스플레이센터)
Han, Jeong-In (전자부품연구원 디스플레이센터)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.20, no.1, 2007 , pp. 53-56 More about this Journal
Abstract
We have fabricated organic white light emitting diodes by mixing two colors from very thin rubrene doped and non-doped DPVBi layers. The device structure was ITO/2-TNATA(15 nm)/${\alpha}$-NPD(35 nm)/DPVBi:rubrene(5 nm)/DPVBi(30 nm)/$Alq_{3}(5\;nm)$/BCP(5 nm)/LiF(0.5 nm)/Al(150 nm). The yellow-emitting rubrene of 0.7 wt % was doped into the blue-emitting DPVBi host for the white light. CIE coordinate of the device was (0.31, 0.33) at 8 V. The color coordinates were stable at wide ranges of driving voltages. The luminance was over $1,000\;cd/m^{2}$ at 8 V and increases to $14,500\;cd/m^{2}$ at 12 V. The maximum current efficiency of the device was 8.2 cd/A at $200\;cd/m^{2}$.
Keywords
OLED; White light emission; Very thin omission layer; Two colors; Rubrene;
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