Molecular Organic White Light-Emitting Devices Fabricated by a Simple Way through Nondoped Process

we designed and fabricated a white organic light-emitting device based on{[2-methyl-6-[2-(2,3,6,7-tetrahydro-1H,5H-benzo[ij]quinolizin-9yl)ethenyl]-4H-pyran-4-ylidene] propane-dinitrile}ultrathin layer and 4,4 ´ -bis(2,2 ˊ diphenylvinyl)-1,1 ˊ -biphenyl. It shows a maximum power efficiency of 1.8l m/W at 4 V (the brightness is 51 cd/m2). Its brightness reaches 8496 cd/m2 at 16 V. And the chromaticity coordinates varying from (0.42,0.34) to (0.32,0.28) with the forward bias from 4 to 16 V are well within the white region.

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High-Efficient Non-Doped Type White Organic Light-Emitting Devices Using an Electron/Exciton Blocker

Materials Science Forum ◽

10.4028/www.scientific.net/msf.475-479.1799 ◽

2005 ◽

Vol 475-479 ◽

pp. 1799-1804

Author(s):

Wenfa Xie ◽

Shi Yong Liu

Keyword(s):

Power Efficiency ◽

Maximum Power ◽

Light Emitting ◽

Light Emitting Devices ◽

White Region ◽

Organic Light ◽

High Efficient ◽

Organic Electroluminescent ◽

Cie Coordinates ◽

Organic Light Emitting Devices

Non-doped type white organic electroluminescent (EL) devices have the following structure ITO/m-MTDATA (30nm) /NPB (20-dnm) /rubrene (0.1nm) /NPB (dnm) /DPVBi (20nm) /TPBi (20nm) /Alq (10nm) /LiF/Al were fabricated. The EL spectrum of the devices are dependent on the d and when d=3, the CIE coordinates of the device were well within the white region for voltage raging from 3V to 15V. This device has a luminance of 18950cd/m2 at 15V and maximum power efficiency of 5.65cd/A at 6V.

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Highly efficient, ultralow turn-on voltage red and white organic light-emitting devices based on a novel exciplex host

Materials Advances ◽

10.1039/d0ma01005g ◽

2021 ◽

Author(s):

Jian Song ◽

Fujun Zhang ◽

Liping Yang ◽

Keming Chen ◽

Asu Li ◽

...

Keyword(s):

Power Efficiency ◽

High Performance ◽

Maximum Power ◽

Light Emitting ◽

Light Emitting Devices ◽

Turn On ◽

Highly Efficient ◽

Organic Light ◽

White Oleds ◽

Organic Light Emitting Devices

We have prepared high-performance white OLEDs based on exciplex systems and blue ultra-thin FIrPic layers, exhibiting a low turn-on voltage of 2.2 V with a maximum power efficiency of 34.1 lm W−1, and the CIE coordinate (0.33,0.33) at 1000 cd m−2.

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Effect of BCP ultrathin layer on the performance of organic light-emitting devices

Optoelectronics Letters ◽

10.1007/s11801-008-8034-2 ◽

2008 ◽

Vol 4 (5) ◽

pp. 317-320 ◽

Cited By ~ 5

Author(s):

Hong Wang ◽

Jun-sheng Yu ◽

Lu Li ◽

Xiao-qing Tang ◽

Ya-dong Jiang

Keyword(s):

Light Emitting ◽

Light Emitting Devices ◽

Organic Light ◽

Organic Light Emitting Devices ◽

Ultrathin Layer

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Optimization for white organic light-emitting diode based on DCJTB as color conversion layer

International Journal of Modern Physics B ◽

10.1142/s0217979218502995 ◽

2018 ◽

Vol 32 (27) ◽

pp. 1850299

Author(s):

Pei Wang ◽

Zhen Wang ◽

Ai Chen ◽

Jia-Feng Xie ◽

Xin Zheng

Keyword(s):

Current Efficiency ◽

Current Density ◽

White Light ◽

Power Efficiency ◽

Light Emitting Diode ◽

Light Emitting ◽

Organic Light Emitting Diode ◽

Organic Light ◽

High Efficient ◽

Color Conversion

In this paper, combining phosphorescence and fluorescence to form white light was realized based on DCJTB:PMMA/ITO/NPB/TCTA/FIrpic:TCTA/TPBi/Ir(ppy)3:TPBi/TPBi/Cs2CO3/Al. The effects of red fluorescence on this white light device was studied by adjusting the concentration of DCJTB. The study shows that the device with a DCJTB concentration of 0.7% in the color conversion layer (CCL) generates a peak current efficiency and power efficiency of 23.4 cd ⋅ A[Formula: see text] and 7.5 lm ⋅ W[Formula: see text], respectively. And it is closest to the equal-energy white point of (0.33, 0.33) which shows a CIE (Commission Internationale de L’Eclairage) coordinate of (0.35, 0.43) and a color rendering index (CRI) of 70 at current density of 10 mA ⋅ cm[Formula: see text]. In order to improve the efficiency, we design and fabricate both high efficient and pure white organic light-emitting diode (WOLED) by replacing the single blue emission layer (EML) with double EMLs of FIrpic:TCTA and FIrpic:TPBi. The further study shows that, when the layers of EML is three and the concentration of DCJTB at 0.7%, the device exhibits good performance specifically, at current density of 10 mA ⋅ cm[Formula: see text], the current efficiency of 28.2 cd ⋅ A[Formula: see text] (power efficiency of 10.3 lm ⋅ W[Formula: see text]), and the CIE coordinate of (0.33, 0.31) (CRI of 80.38).

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High Brightness White Organic Light Emitting Devices Employing Phosphorescent Iridium Complex as RGB Dopants

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.364-366.1072 ◽

2007 ◽

Vol 364-366 ◽

pp. 1072-1076

Author(s):

Rui Li Song ◽

Yu Duan

Keyword(s):

Power Efficiency ◽

Light Emitting Diode ◽

Iridium Complex ◽

Light Emitting ◽

Light Emitting Devices ◽

Organic Light Emitting Diode ◽

Organic Light ◽

Color Mixing ◽

Coordinate Changes ◽

Cie Chromaticity

An efficient phosphorescent white organic light-emitting diode (WOLED) was realized by using a bright blue-emitting layer, iridium (III) bis [(4, 6-di-fluoropheny)-pyridinato-N, C2’] picolinate doped 4.4’-bis (9-carbazolyl)-2, 2’-dimethyl-biphenyl, together with tris (2- Phenylpyridine) iridium and bis (1-phenyl-isoquinoline) acetylacetonate iridium (III) were codoped into 4,4’-N,N’-dicarbazole-biphenyl layer to provide blue, green, and red emission for color mixing. The device emission color was controlled by varying dopant concentrations and the thickness of blue and green-red layers as well as tuning the thickness of exciton-blocking layer. The maximum luminance and power efficiency of the WOLED were 37100cd/m2 at 17 V and 7.37lm/W at 5V, respectively. The Commission Internationale de 1’Eclairage (CIE) chromaticity coordinate changes from (0.41, 0.42) to (0.37, 0.39) when the luminance rangeed from 1000cd/m2 to 30000cd/m2.

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The Physics of Organic Light-Emitting Devices

MRS Proceedings ◽

10.1557/proc-558-499 ◽

1999 ◽

Vol 558 ◽

Cited By ~ 2

Author(s):

J. Campbell Scott ◽

George G. Malliaras ◽

Luisa Bozano ◽

Sue A. Carter ◽

Sergio Ramos

Keyword(s):

Electrical Properties ◽

Charge Transport ◽

Power Efficiency ◽

Operating Voltage ◽

Basic Principles ◽

Light Emitting ◽

Light Emitting Devices ◽

Numerical Studies ◽

Organic Light ◽

Quantitative Understanding

ABSTRACTQualitatively, the basic principles behind the operation of OLEDs are well established. In order to optimize device parameters such as power efficiency and operating voltage, to explore the limits of performance and to understand changes in the electrical properties as diodes age, it is necessary to develop a quantitative understanding of each of the relevant processes: injection of electrons and holes at the cathode and anode, charge transport, recombination and exciton formation, and emission. In this paper, we summarize our experimental, theoretical and numerical studies to address these issues.

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9,9-Diphenyl-thioxanthene derivatives as host materials for highly efficient blue phosphorescent organic light-emitting diodes

Journal of Materials Chemistry C ◽

10.1039/c5tc01749a ◽

2015 ◽

Vol 3 (38) ◽

pp. 9999-10006 ◽

Cited By ~ 27

Author(s):

Kunkun Liu ◽

Xiang-Long Li ◽

Ming Liu ◽

Dongcheng Chen ◽

Xinyi Cai ◽

...

Keyword(s):

Quantum Efficiency ◽

External Quantum Efficiency ◽

Power Efficiency ◽

Light Emitting Diodes ◽

Maximum Power ◽

Organic Light Emitting Diodes ◽

Light Emitting ◽

Organic Light ◽

Host Materials ◽

Blue Phosphorescent

A series of 9,9-diphenyl-9H-thioxanthene derivatives are reported as host materials in blue phosphorescent OLEDs, giving a maximum power efficiency of 69.7 lm W−1 and an external quantum efficiency of 29.0%.

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