Small molecular and polymer organic light-emitting diodes based on novel iridium complex phosphor

Yu, Junsheng; Wang, Jun; Lou, Shuangling; Wang, Tao; Jiang, Yadong

doi:10.1016/j.displa.2008.04.004

Cited by 8 publications

(2 citation statements)

References 19 publications

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“…In recent years, organic light-emitting diodes (OLEDs), particularly white OLEDs, have been attracting intensive interests due to their potential applications as flat-panel displays, liquid-crystal-displays and solid-state lightings [1][2][3][4] . These applications require white OLEDs with high brightness, high efficiency, high-color stability and long lifetime.…”

Section: Introductionmentioning

confidence: 99%

White organic light-emitting diodes based on doped and ultrathin Rubrene layer

Jiang

Wen

et al. 2010

SPIE Proceedings

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Based on a yellow fluorescent dye of 5, 6, 11, 12-tetraphenylnaphthacene (Rubrene), WOLEDs were fabricated, with doping structure and ultrathin layer structure utilized in the devices. By doping Rubrene into blue-emitting N,N'-bis-(1-naphthyl)-N,N'-biphenyl-1,1'-biphenyl-4,4'-diamine (NPB), the device with a structure of indium-tin-oxide (ITO)/NPB (40 nm)/NPB:Rubrene (0.25 wt%, 7 nm)/2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) (30 nm)/Mg:Ag exhibited a warm white light with Commissions Internationale De L'Eclairage (CIE) coordinates of (0.38, 0.41) at 12 V. The electroluminescent spectrum of the OLED consisted of blue and yellow fluorescent emissions, the intensity of blue emission increased gradually relative to the orange emission with increasing voltage. This is mainly due to the recombination zone shifted towards the anode side as the transmission rate of electrons grows faster than that of holes under higher bias voltage. A maximum luminance of 7300 cd/m 2 and a maximum power efficiency of 0.57 lm/W were achieved. Comparatively, by utilizing ultrathin dopant layer, the device with a structure of ITO/NPB (40 nm)/Rubrene (0.3 nm)/NPB (7 nm)/BCP (30 nm)/Mg:Ag achieved a low turn-on voltage of 3 V and a more stable white light. The peaks of EL spectra located at 430 and 560 nm corresponding to the CIE coordinates of (0.32, 0.32) under bias voltage ranging from 5 to 15 V. A maximum luminance of 5630 cd/m 2 and a maximum power efficiency of 0.6 lm/W were achieved. The balanced spectra were attributed to the stable confining of charge carriers and exciton by the thin emitting layers. Hence, with simple device structure and fabricating process, the device with ultrathin layer achieved low turn-on voltage, stable white light emitting and higher power efficiency.

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Section: Introductionmentioning

confidence: 99%

White organic light-emitting diodes based on doped and ultrathin Rubrene layer

Jiang

Wen

et al. 2010

SPIE Proceedings

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“…For instance, a novel MOLED using iridium complex phosphor is described in [78]. In comparison with previous MOLEDs and POLEDs (polymer OLED's), this new nano-component has higher efficiency and narrower spectrum width (the emitted power is more concentrated to the expected emission wavelength).…”

Section: Moled'smentioning

confidence: 99%