Ligand Engineering to Improve the Luminance Efficiency of CsPbBr3 Nanocrystal Based Light-Emitting Diodes

2018 ◽  
Vol 122 (25) ◽  
pp. 13767-13773 ◽  
Author(s):  
Naresh Kumar Kumawat ◽  
Abhishek Swarnkar ◽  
Angshuman Nag ◽  
Dinesh Kabra
Keyword(s):  
Light Emitting Diodes ◽  
Light Emitting ◽  
Luminance Efficiency

Effect of Li2O/Al Cathode in Alq3 Based Organic Light-Emitting Diodes

2008 ◽  
Vol 8 (9) ◽  
pp. 4684-4687 ◽  
Author(s):  
Eun Chul Shin ◽  
Hui Chul Ahn ◽  
Wone Keun Han ◽  
Tae Wan Kim ◽  
Won Jae Lee ◽  
...  
Keyword(s):  
Power Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Turn On ◽  
Organic Light ◽  
Maximum Current ◽  
The One ◽  
Luminance Efficiency ◽  
A Current

An effect of bilayer cathode Li2O/Al was studied in Alq3 based organic light-emitting diodes with a variation of Li2O layer thickness. The current-luminance-voltage characteristics of ITO/TPD/Alq3/Li2O/Al device were measured at ambient condition to investigate the effect of Li2O/Al. It was found that when the thickness of Li2O layer is in the range of 0.5∼1 nm, there are improvements in luminance, efficiency, and turn-on voltage of the device. A current density and a luminance are increased by about 100 times, a turn-on voltage is lowered from 6 V to 3 V, a maximum current efficiency is improved by a factor of 2.3, and a maximum power efficiency is improved by a factor of 3.2 for a device with a use of thin Li2O layer compared to those of the one without the Li2O layer. These improvements are thought to be due to a lowering of electron-barrier height for electron injection from the cathode to the emissive layer.

Enhancement of the luminance efficiency for top-emitting DB-PPV polymer light-emitting diodes with Ca/Ag cathode

2008 ◽  
Vol 111 (1) ◽  
pp. 158-161 ◽  
Author(s):  
Chia-Hung Tsai ◽  
Mau-Shang Chang ◽  
Chien-Chih Liu ◽  
Sheng-Yuan Chu ◽  
Chen-I. Hung ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Light Emitting ◽  
Polymer Light Emitting Diodes ◽  
Luminance Efficiency

Improvement in Luminance Efficiency by Insertion of Buffer Layers in Flexible Organic Light-Emitting Diodes

2006 ◽  
Vol 45 (4B) ◽  
pp. 3729-3732 ◽  
Author(s):  
Tsung-Hsien Yang ◽  
Fuh-Shyang Juang ◽  
Yu-Sheng Tsai ◽  
Wen-Kai Kuo ◽  
Meiso Yokoyama
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Buffer Layers ◽  
Light Emitting ◽  
Organic Light ◽  
Luminance Efficiency

scholarly journals Position Effects of Metal Nanoparticles on the Performance of Perovskite Light-Emitting Diodes

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 993
Author(s):  
Chen-Min Yang ◽  
Fang-Chung Chen
Keyword(s):  
Metal Nanoparticles ◽  
Light Emitting Diodes ◽  
Device Performance ◽  
Perovskite Layer ◽  
Position Effects ◽  
Au Nps ◽  
Light Emitting ◽  
Hole Transporting ◽  
Near Future ◽  
Luminance Efficiency

Metal nanoparticles have been widely used for improving the efficiencies of many optoelectronic devices. Herein, position effects of gold nanoparticles (Au NPs) on the performance of perovskite light-emitting diodes (PeLEDs) are investigated. Amphiphilic Au NPs are synthesized so that they can be incorporated into different layers of the PeLEDs to enhance device efficiencies. The photoluminescent (PL) studies indicate apparent position effects; the strongest PL intensity occurs when the NPs are directly blended with the light-emitting perovskite layer. In contrast, the PeLEDs exhibit the highest luminance efficiency while the Au NPs are placed in the hole-transporting layer. The direct blending of the NPs in the perovskite layer might affect the electrical properties, resulting in inferior device performance. The results reported herein can help to understand the enhancing mechanism of the PeLEDs and may also lead to even better efficiencies in the near future.

9-(10-phenylanthracen-9-yl)-Benzo[b]Fluoreno[3,4-d] Thiophene Derivatives for Blue Organic Light-Emitting Diodes

2021 ◽  
Vol 21 (7) ◽  
pp. 3914-3918
Author(s):  
Beomsu Jang ◽  
Giwoong Han ◽  
Kiju Kim ◽  
Hakjun Lee ◽  
Youngkwan Kim ◽  
...  
Keyword(s):  
Power Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Blue Fluorescence ◽  
Light Emitting ◽  
Emissive Layer ◽  
Organic Light ◽  
Thiophene Derivatives ◽  
Cie Coordinates ◽  
Luminance Efficiency

In this study, two blue fluorescence materials using phenylanthracene-substituted fluorene derivatives were synthesized and characterized for organic light-emitting diodes (OLEDs). To study their electroluminescent properties, OLED devices were fabricated using these two materials as emissive layer (EML). A device using 7,7-diphenyl-9-(10-phenylanthracen-9-yl)-7H-benzo[b]fluoreno[3,4-d]thiophene in emitting layer showed the highest value of EQE value which is 3.51%. It also showed the luminance efficiency of 3.22 cd/A and power efficiency of 2.89 lm/W with the CIE coordinates (0.15, 0.09).

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