A yellow-emitting iridium complex for use in phosphorescent multiple-emissive-layer white organic light-emitting diodes with high color quality and efficiency

Yu, Xiaoqin; Zhou, Guoquan; Lam, Ching Shan; Wong, Wai Yeung; Zhu, Xiu Ling; Sun, Jia Xin; Wong, Man; Kwok, Hoi Sing

doi:10.1016/j.jorganchem.2007.10.021

Cited by 91 publications

(26 citation statements)

References 55 publications

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“…[1][2][3][4][5] First-generation OLEDs employing bottom-emitting structures with widely used Indium tin oxide (ITO) transparent electrodes have achieved quite low turnon voltage and very high efficiency. For example, Su et al 6 have reported a two-color WOLED reaching 44 lm/W of power efficiency at 1000 cd/m 2 without out-coupling enhancement.…”

Section: Introductionmentioning

confidence: 99%

High performance flexible top-emitting warm-white organic light-emitting devices and chromaticity shift mechanism

et al. 2014

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Flexible warm-white top-emitting organic light-emitting devices (TEOLEDs) are fabricated onto PET substrates with a simple semi-transparent cathode Sm/Ag and two-color phosphors respectively doped into a single host material TCTA. By adjusting the relative position of the orange-red EML sandwiched between the blue emitting layers, the optimized device exhibits the highest power/current efficiency of 8.07 lm/W and near 13 cd/A, with a correlated color temperature (CCT) of 4105 K and a color rendering index (CRI) of 70. In addition, a moderate chromaticity variation of (-0.025, +0.008) around warm white illumination coordinates (0.45, 0.44) is obtained over a large luminance range of 1000 to 10000 cd/m2. The emission mechanism is discussed via delta-doping method and single-carrier device, which is summarized that the carrier trapping, the exciton quenching, the mobility change and the recombination zone alteration are negative to color stability while the energy transfer process and the blue/red/blue sandwiched structure are contributed to the color stability in our flexible white TEOLEDs.

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Section: Introductionmentioning

confidence: 99%

High performance flexible top-emitting warm-white organic light-emitting devices and chromaticity shift mechanism

et al. 2014

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“…12 This was even comparable with the vacuum thermally deposed counterpart. 13 Careful optimization of the dopant content was used to fabricate two-color hybrid white OLEDs with a stable white emission and a high color rendering index of 81.9, a good efficiency of 10.69 cd A…”

Section: Introductionmentioning

confidence: 99%

Solution‐processed high‐performance orange phosphorescent and white PLEDs with a high color‐rendering index from an unprecedented π‐stacked and π‐conjugated host material

Yin

Zhou

et al. 2014

J Polym Sci B Polym Phys

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A blue fluorescent polymer based on poly(vinyl carbazole) (PVK) and terfluorene, combined to make a chemical hybrid at the carbazole unit (PVK-TF), is fully characterized in this study. PVK-TF shows useful emission features, such as peaks at 400, 420, 437, 460, and 496 nm, depending on the processing conditions. It possesses a relatively high triplet energy level (2.23 eV), electrochemical stability, good filmforming ability, and morphological stability. Based on this blue fluorescent material, highly efficient orange phosphorescent polymer light-emitting diodes (PLEDs) were fabricated with a maximum efficiency of 21.99 cd A KEYWORDS: high color rendering index; high performance polymers; light-emitting diodes; morphology; solution process INTRODUCTION In the past two decades, organic light-emitting diodes (OLEDs) have been used to develop high-performance devices, including commercial model OLED displays, because of advantages such as being super-thin, high-contrast, power-saving, flexible, having a fast response, and having a low temperature resistance. The low temperature resistance is uniquely important for application in extreme environments, which is not displaceable for conventional LCD displays. This has been recognized as a promising alternative display and solid-state lighting technology.

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“…This structure is quite good for two color WOLEDs, but not for three color WOLEDs because three color emitters do not have large energy difference. The second method is to insert the interlayer(s) between different emitting layers [22][23][24][25]. This interlayer could control balanced hole and electron movement regardless of voltage increase.…”

Section: Introductionmentioning

confidence: 99%

Color stable phosphorescent white organic light-emitting diodes with double emissive layer structure

Son

Park

Kim

et al. 2013

Organic Electronics

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A yellow-emitting iridium complex for use in phosphorescent multiple-emissive-layer white organic light-emitting diodes with high color quality and efficiency

Cited by 91 publications

References 55 publications

High performance flexible top-emitting warm-white organic light-emitting devices and chromaticity shift mechanism

High performance flexible top-emitting warm-white organic light-emitting devices and chromaticity shift mechanism

Solution‐processed high‐performance orange phosphorescent and white PLEDs with a high color‐rendering index from an unprecedented π‐stacked and π‐conjugated host material

Color stable phosphorescent white organic light-emitting diodes with double emissive layer structure

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