scholarly journals Optimal Color Stability for White Organic Light-Emitting Diode (WOLED) by Using Multiple-Ultra-Thin Layers (MUTL)

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Kan-Lin Chen ◽  
Chien-Jung Huang ◽  
Wen-Ray Chen ◽  
Fong-Yi Lin ◽  
Teen-Hang Meen ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Color Stability ◽  
Thin Layers ◽  
Slight Variation ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Glass Substrates ◽  
Organic Light ◽  
Ito Glass ◽  
Better Than

The work demonstrates the improvement of color stability for white organic light-emitting diode (WOLED). The devices were prepared by vacuum deposition on ITO-glass substrates. These guest materials of 5,6,11,12-tetraphenylnaphthacene (Rubrene) were deposited in 4,4′-bis(2,2-diphenyl vinyl)-1,1′-biphenyl (DPVBi), resulting in an emitting layer. Experimental results reveal that the properties in the multiple-ultra-thin layer (MUTL) are better than those of the emitting layer with a single guest material, reaching the commercial white-light wavelength requirement of 400–700 nm. The function of the MUTL is as the light-emitting and trapping layer. The results show that the MUTL has excellent carrier capture effect, leading to high color stability of the device at various applied voltages. The Commissions Internationale De L’Eclairage (CIE) coordinate of this device at 3~7 V is few displacement and shows a very slight variation of (0.016, 0.009). The CIE coordinates at a maximal luminance of 9980 cd/m2are (0.34, 0.33).

scholarly journals High Stability White Organic Light-Emitting Diode (WOLED) Using Nano-Double-Ultra Thin Carrier Trapping Materials

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Kan-Lin Chen
Keyword(s):  
Indium Tin Oxide ◽  
Molybdenum Trioxide ◽  
Light Emitting Diode ◽  
Charge Trapping ◽  
Color Stability ◽  
Slight Variation ◽  
Maximum Brightness ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light

The structure of indium tin oxide (ITO) (100 nm)/molybdenum trioxide (MoO3) (15 nm)/N,N0-bis-(1-naphthyl)-N,N0-biphenyl-1,10-biphenyl-4,40-diamine (NPB) (40 nm)/4,4′-Bis(2,2-diphenylvinyl)-1,1′-biphenyl (DPVBi) (10 nm)/5,6,11,12-tetraphenylnaphthacene (Rubrene) (0.2 nm)/DPVBi (24 nm)/Rubrene (0.2 nm)/DPVBi (6 nm)/4,7-diphenyl-1,10-phenanthroline (BPhen): cesium carbonate (Cs2Co3) (10 nm)/Al (120 nm) with high color purity and stability white organic light-emitting diode (WOLED) was fabricated. The function of the multiple-ultra-thin material (MUTM), such as Rubrene, is as the yellow light-emitting layer and trapping layer. The results show that the MUTM has an excellent carrier capture effect, resulting in high color stability of the device at different applied voltages. The Commissions Internationale De L’Eclairage (CIE) coordinate of this device at 3~7 V is few displacement and shows a very slight variation of (±0.01, ±0.01). The maximum brightness of 9986 cd/m2and CIE coordinates of (0.346, 0.339) are obtained at 7 V. The enhanced performance of the device may result from the direct charge trapping in MUTM and it can be found in the electroluminescence (EL) process.

Using interlayer step-wise triplet transfer to achieve an efficient white organic light-emitting diode with high color-stability

2014 ◽  
Vol 104 (19) ◽  
pp. 193303 ◽  
Author(s):  
Qi Wang ◽  
Dongge Ma ◽  
Karl Leo ◽  
Junqiao Ding ◽  
Lixiang Wang ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Color Stability ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light

Characteristics of Amorphous Indium Zinc Oxide Anode Films on Polycarbonate Substrate for Flexible Organic Light Emitting Diode

2007 ◽  
Vol 124-126 ◽  
pp. 399-402 ◽  
Author(s):  
Han Ki Kim ◽  
Jung Hyeok Bae ◽  
Jong Min Moon ◽  
Sang Woo Kim ◽  
Soon Wook Jeong ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Room Temperature ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Indium Zinc Oxide ◽  
Organic Light ◽  
Ito Glass ◽  
Anode Film ◽  
Anode Films

Electrical, optical, and structural properties of amorphous indium zinc oxide (IZO) anode films grown on flexible polycarbonate (PC) substrate were investigated. The x-ray diffraction (XRD) result shows that the IZO film grown at room temperature is complete amorphous structure due to low substrate temperature. A sheet resistance of 34.1 ,/, average transmittance above 88.9% in visible range, and root mean spare roughness of 3.5~10.5 Å were obtained even in the amorphous IZO anode film grown on PC substrate at room temperature. It is shown that the Ir(ppy)3 doped-flexible organic light emitting diode (OLED) fabricated on the amorphous IZO anode exhibit comparable current-voltage-luminance characteristics as well as external quantum efficiency and power efficiency to OLED fabricated on conventional ITO/glass substrate. These findings indicate that the IZO anode film is a promising anode material for the fabrication of flexible OLEDs.

High color stability and CRI (>80) fluorescent white organic light-emitting diode based pure emission of exciplexes by employing merely complementary colors

2018 ◽  
Vol 6 (2) ◽  
pp. 304-311 ◽  
Author(s):  
Bo Zhao ◽  
Heng Zhang ◽  
Yanqin Miao ◽  
Ziqi Wang ◽  
Long Gao ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Color Stability ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light

High color stability and CRI (>80) pure exciplex WOLEDs with merely complementary colors of orange- and blue-exciplexes are realized with the application of spacers.

scholarly journals Low efficiency roll-off and high color stability pure fluorescent white organic light-emitting diode based exciplex host

RSC Advances ◽  
2018 ◽  
Vol 8 (2) ◽  
pp. 954-959 ◽  
Author(s):  
Heng Zhang ◽  
Ziqi Wang ◽  
Long Gao ◽  
Bo Zhao ◽  
Wenlian Li
Keyword(s):  
Light Emitting Diode ◽  
Color Stability ◽  
Triplet Exciton ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Low Efficiency

Low efficiency roll-off and high color stability pure fluorescent WOLEDs with a blue exciplex host and orange rubrene dopant were realized by utilizing the bipolarity and triplet exciton up-conversion of the exciplex host.

Controlling the carrier recombination zone for improved color stability in a two-dopant fluorophore/phosphor white organic light-emitting diode

2009 ◽  
Vol 94 (20) ◽  
pp. 203501 ◽  
Author(s):  
Unnat S. Bhansali ◽  
Huiping Jia ◽  
M. A. Quevedo Lopez ◽  
Bruce E. Gnade ◽  
Wei-Hsuan Chen ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Color Stability ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Carrier Recombination ◽  
Organic Light ◽  
Recombination Zone

Effect of multi-trapping layers on high color stability of white organic light-emitting diode (WOLED)

2013 ◽  
pp. 51-53
Author(s):  
Kan-Lin Chen ◽  
Chien-Jung Huang ◽  
Fong-Yi Lin ◽  
Dei-Wei Chou ◽  
Wen-Ray Chen ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Color Stability ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light

scholarly journals Fluorene–Triphenylamine-Based Bipolar Materials: Fluorescent Emitter and Host for Yellow Phosphorescent OLEDs

2020 ◽  
Vol 10 (2) ◽  
pp. 519
Author(s):  
Ramanaskanda Braveenth ◽  
Hasu Jung ◽  
Keunhwa Kim ◽  
Bo Mi Kim ◽  
Il-Ji Bae ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Maximum Current ◽  
Better Than

In this study, two new bipolar materials were designed and synthesized: N1-(9,9-diphenyl-9H-fluoren-2-yl)-N1-(4,6-diphenylpyrimidin-2-yl)-N4,N4-diphenylbenzene-1,4-diamine (FLU-TPA/PYR) and N1-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-N1-(9,9-diphenyl-9H-fluoren-2-yl)-N4,N4 diphenylbenzene-1,4-diamine (FLU-TPA/TRZ). We fabricated two different devices, namely a yellow phosphorescent organic light-emitting diode (PhOLED) and a non-doped fluorescent OLED emitter with both FLU-TPA/PYR and FLU-TPA/TRZ. The FLU-TPA/PYR host-based yellow PhOLED device showed better maximum current, power and external quantum efficiencies at 21.70 cd/A, 13.64 lm/W and 7.75%, respectively. The observed efficiencies were better than those of the triazine-based FLU-TPA/TRZ. The non-doped fluorescent device with the triazine-based FLU-TPA/TRZ material demonstrated current, power and external quantum efficiencies of 10.30 cd/A, 6.47 lm/W and 3.57%, respectively.

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