scholarly journals Flexible White Top-Emitting Organic Light-Emitting Diodes with a High Efficiency and an Excellent Color Stability

2012 ◽  
Author(s):  
Shufen Chen ◽  
Qiang Wu ◽  
Wei Huang
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Color Stability ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Excellent Color

Novel Fluoranthene Structure for Deep-Blue Organic Light-Emitting Diodes

2008 ◽  
Vol 8 (9) ◽  
pp. 4787-4792 ◽  
Author(s):  
Soo-Kang Kim ◽  
Jong-Wook Park
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Blue Region ◽  
Deep Blue ◽  
Organic Light ◽  
Color Coordinate ◽  
Excellent Color

As a new fluoranthene derivative, a synthesis of benzo[k]fluoranthene was suggested, so new blue emitting materials, 7,12-diphenylbenzo[k]fluoranthene [DPBF] and 7,8,10-triphenylfluoranthene [TPF] were synthesized. PLmax values of both compounds showed the wavelengths of 458 nm (TPF) and 434 nm, 453 nm (DPBF) that are in blue region. ELmax wavelength of the device using DPBF as an emitting layer was 436 and 454 nm in the deep-blue region, which are similar values with PL. The device that used DPBF as an emitting layer showed high efficiency of 2.11 cd/A and the excellent color coordinate value of (0.161, 0.131) in deep-blue region.

Extremely stable-color flexible white organic light-emitting diodes with efficiency exceeding 100 lm W−1

2014 ◽  
Vol 2 (46) ◽  
pp. 9836-9841 ◽  
Author(s):  
Baiquan Liu ◽  
Lei Wang ◽  
Miao Xu ◽  
Hong Tao ◽  
Dongyu Gao ◽  
...  
Keyword(s):  
Optical Properties ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Color Stability ◽  
Organic Light Emitting Diodes ◽  
Electrical And Optical Properties ◽  
Light Emitting ◽  
Organic Light

Flexible WOLEDs with extremely high efficiency and color-stability are realizedviathe extraordinary combination of mechanical, electrical and optical properties.

High-Efficiency Red-Fluorescent Organic Light-Emitting Diodes with Excellent Color Purity

2021 ◽  
Vol 125 (3) ◽  
pp. 1980-1989
Author(s):  
Zhiyi Li ◽  
Xiaoxiao Hu ◽  
Guanhao Liu ◽  
Lei Tian ◽  
Honglei Gao ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Color Purity ◽  
Light Emitting ◽  
Organic Light ◽  
Excellent Color

scholarly journals High-efficiency/CRI/color stability warm white organic light-emitting diodes by incorporating ultrathin phosphorescence layers in a blue fluorescence layer

Nanophotonics ◽  
2018 ◽  
Vol 7 (1) ◽  
pp. 295-304 ◽  
Author(s):  
Yanqin Miao ◽  
Kexiang Wang ◽  
Bo Zhao ◽  
Long Gao ◽  
Peng Tao ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Color Stability ◽  
Organic Light Emitting Diodes ◽  
Color Temperature ◽  
Blue Fluorescence ◽  
Voltage Range ◽  
Light Emitting ◽  
Organic Light ◽  
Device Efficiency

AbstractBy incorporating ultrathin (<0.1 nm) green, yellow, and red phosphorescence layers with different sequence arrangements in a blue fluorescence layer, four unique and simplified fluorescence/phosphorescence (F/P) hybrid, white organic light-emitting diodes (WOLEDs) were obtained. All four devices realize good warm white light emission, with high color rending index (CRI) of >80, low correlated color temperature of <3600 K, and high color stability at a wide voltage range of 5 V–9 V. These hybrid WOLEDs also reveal high forward-viewing external quantum efficiencies (EQE) of 17.82%–19.34%, which are close to the theoretical value of 20%, indicating an almost complete exciton harvesting. In addition, the electroluminescence spectra of the hybrid WOLEDs can be easily improved by only changing the incorporating sequence of the ultrathin phosphorescence layers without device efficiency loss. For example, the hybrid WOLED with an incorporation sequence of ultrathin red/yellow/green phosphorescence layers exhibits an ultra-high CRI of 96 and a high EQE of 19.34%. To the best of our knowledge, this is the first WOLED with good tradeoff among device efficiency, CRI, and color stability. The introduction of ultrathin (<0.1 nm) phosphorescence layers can also greatly reduce the consumption of phosphorescent emitters as well as simplify device structures and fabrication process, thus leading to low cost. Such a finding is very meaningful for the potential commercialization of hybrid WOLEDs.

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