Luminous efficiency improvement of polymer light-emitting diodes with platinum nanolayer at PEDOT:PSS–ITO interface

2021 ◽  
Author(s):  
Sy-Hann Chen ◽  
Pei-Ju Hsu
Keyword(s):  
Light Emitting Diodes ◽  
Luminous Efficiency ◽  
Efficiency Improvement ◽  
Light Emitting ◽  
Polymer Light Emitting Diodes

High Efficient White Organic Light-Emitting Diodes Using BCzVBi as Blue Fluorescent Dopant

2008 ◽  
Vol 8 (9) ◽  
pp. 4579-4583
Author(s):  
You-Hyun Kim ◽  
Su-Hwan Lee ◽  
Hyun-Soo Yoon ◽  
Jae-Yoon Choi ◽  
Sung Sik Shin ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Light Emitting Diodes ◽  
Luminous Efficiency ◽  
Organic Light Emitting Diodes ◽  
Efficiency Improvement ◽  
Light Emitting ◽  
Organic Light ◽  
High Efficient

Efficiency improvement and color optimization of white organic light-emitting diodes (WOLEDs) were achieved via employing blue host DPVBi doped with blue fluorescent, BCzVBi. The structure of high efficient WOLED device was composed of ITO/NPB/DPVBi:BCzVBi-6%/MADN:DCM2-0.5%/Bphen/Liq/Al. WOLED doped by blue fluorescent BCzVBi exhibits 6.19 cd/A of luminous efficiency and 15400 cd/m2 of maximum luminescence. It also performs 480 cd/m2 of luminance at 5.7 V and 15,400 cd/m2 at 12.9 V with CIEx,y coordinates of (0.33, 0.32) and (0.32, 0.32), respectively. Hole carrier and energy transfer from DPVBi to BCzVBi are proposed to explain the observed phenomena.

Influence of the Silver Nanocrystal Shape on the Luminous Efficiency of Blue-Emitting Polymer Light-Emitting Diodes

Langmuir ◽  
2019 ◽  
Vol 35 (47) ◽  
pp. 15114-15120
Author(s):  
Cheng-Liang Huang ◽  
Sy-Hann Chen ◽  
Cheng-Ying Wu ◽  
Yi-Shan Sie ◽  
Po-Ching Kao
Keyword(s):  
Light Emitting Diodes ◽  
Luminous Efficiency ◽  
Light Emitting ◽  
Polymer Light Emitting Diodes

Highly Efficient White Polymer Light-Emitting Diodes with a Conjugated Polyelectrolyte as Host Polymer

2012 ◽  
Vol 516-517 ◽  
pp. 1881-1884
Author(s):  
Qiaol Niu ◽  
Ling Zhi Zhao ◽  
Yong Zhang ◽  
Xin Li ◽  
Yong Li Wang
Keyword(s):  
Sulfonic Acid ◽  
Light Emitting Diodes ◽  
Weight Ratio ◽  
Luminous Efficiency ◽  
Device Structure ◽  
Conjugated Polyelectrolyte ◽  
Light Emitting ◽  
Polymer Light Emitting Diodes ◽  
High Work ◽  
Host Polymer

In this presentation, efficient white polymer-light-emitting diodes have been fabricated with high work-function cathode. The device structure consists of ITO/poly(ehtlenedioxythiophene) : poly(styrene sulfonic acid) (PEDOT : PSS) / poly(N-vinylcarbazole) (PVK) / poly[(9,9-bis(30-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt- 2,7-(9,9-dioctylfluorene)] (PFN): bis(2-(4,6-difluorophenyl)-pyridinato-N,C2') picolinate (FIrpic): poly[2,7-(9,9-dioc-tylfluorene)-co-(4,7-dithien-2-yl)-2,1,3-benzothiadiazole] (PFODBT15)/Al. By tuning the weight ratio of FIrpic to PFO-DBT15 in PFN, white light was obtained. The 1931 CIE coordinates of the white lights obtained were (0.37, 0.41) and (0.36, 0.42). The maximum luminous efficiency was 3 cd/A.

Injecting Inter-Layers and the Built-in Potential of Blue Polymer Light-Emitting Diodes

2000 ◽  
Vol 660 ◽  
Author(s):  
Thomas M. Brown ◽  
Ian S. Millard ◽  
David J. Lacey ◽  
Jeremy H. Burroughes ◽  
Richard H. Friend ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Light Emitting Diodes ◽  
Basic Structure ◽  
Thin Layers ◽  
Carrier Injection ◽  
Semiconducting Polymer ◽  
Light Emitting ◽  
Physical Mechanisms ◽  
Organic Solid ◽  
Polymer Light Emitting Diodes

ABSTRACTThe semiconducting-polymer/injecting-electrode heterojunction plays a crucial part in the operation of organic solid state devices. In polymer light-emitting diodes (LEDs), a common fundamental structure employed is Indium-Tin-Oxide/Polymer/Al. However, in order to fabricate efficient devices, alterations to this basic structure have to be carried out. The insertion of thin layers, between the electrodes and the emitting polymer, has been shown to greatly enhance LED performance, although the physical mechanisms underlying this effect remain unclear. Here, we use electro-absorption measurements of the built-in potential to monitor shifts in the barrier height at the electrode/polymer interface. We demonstrate that the main advantage brought about by inter-layers, such as poly(ethylenedioxythiophene)/poly(styrene sulphonic acid) (PEDOT:PSS) at the anode and Ca, LiF and CsF at the cathode, is a marked reduction of the barrier to carrier injection. The electro- absorption results also correlate with the electroluminescent characteristics of the LEDs.

Geometrically isomeric [Ir(iqbt)(ppy)(hpa)] complexes with differential molecule orientations for efficient near-infrared (NIR) polymer light-emitting diodes (PLEDs)

2021 ◽  
Vol 9 (36) ◽  
pp. 12068-12072
Author(s):  
Wentao Li ◽  
Jiaxiang Liu ◽  
Baowen Wang ◽  
Siyu Hou ◽  
Xingqiang Lü ◽  
...  
Keyword(s):  
Near Infrared ◽  
Light Emitting Diodes ◽  
Dipole Transition ◽  
Transition Dipole ◽  
Light Emitting ◽  
Horizontal Orientation ◽  
Polymer Light Emitting Diodes

Based on geometrical isomerisation of [Ir(C^N1)(C^N2)((N^O))]-tris-heteroleptic Ir(iii)-complexes, the augmented transition dipole transition (TMD) with a preferential horizontal orientation, which is beneficial for their NIR-phosphorescence, is reported.

Efficient electron injection in blue-emitting polymer light-emitting diodes with LiF/Ca/Al cathodes

2001 ◽  
Vol 79 (2) ◽  
pp. 174-176 ◽  
Author(s):  
T. M. Brown ◽  
R. H. Friend ◽  
I. S. Millard ◽  
D. J. Lacey ◽  
J. H. Burroughes ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Electron Injection ◽  
Light Emitting ◽  
Polymer Light Emitting Diodes

Efficient Single Active Layer Electrophosphorescent White Polymer Light-Emitting Diodes

2008 ◽  
Vol 20 (4) ◽  
pp. 696-702 ◽  
Author(s):  
H. B. Wu ◽  
J. H. Zou ◽  
F. Liu ◽  
L. Wang ◽  
A. Mikhailovsky ◽  
...  
Keyword(s):  
Active Layer ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Polymer Light Emitting Diodes
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