scholarly journals A New Benchmark of Charges Storage in Single-Layer Organic Light-Emitting Diodes Based on Electrical and Optical Characteristics

Molecules ◽  
2021 ◽  
Vol 26 (3) ◽  
pp. 741
Author(s):  
Chengwen Zhang ◽  
Zheng Xu ◽  
Peng Wang ◽  
Zilun Qin ◽  
S. Wageh ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Light Emitting Diodes ◽  
Traditional Approach ◽  
Single Layer ◽  
Organic Light Emitting Diodes ◽  
Optical Characteristics ◽  
Device Performance ◽  
Light Emitting ◽  
Organic Light ◽  
Transient Measurement

The storage of charges in organic light-emitting diodes (OLEDs) has drawn much attention for its damage to device performance as well as the loss to carriers. Thus, it is essential to address the issue and do further investigation. The traditional approach to storage analysis is mainly based on transient measurement since it is sensitive to transient instead of steady signal. In this paper, we proposed a new benchmark to investigate the single-layer OLEDs capable of stored charges with poly (methyl methacrylate) (PMMA), which is just based on electrical and optical characteristics. Since the stored charges contribute both to luminance and current of the devices with PMMA, the area between them can be taken as a benchmark and evaluated the storage of charges. In our experiment, the areas of 4 nm, 6 nm, 8 nm, and 10 nm PMMA devices are 0.348, 0.554, 0.808, and 0.894, respectively, indicating a higher capability of storage in thicker PMMA. It is exactly in line with the results taken from transient electroluminescence (EL) measurement. Thus, this new benchmark is practical and provides a more accessible approach to investigate the storage of charges in OLEDs.

Pyridine-Incorporated Dihexylquaterthiophene: A Novel Blue Emitter for Organic Light Emitting Diodes (OLEDs)

2012 ◽  
Vol 65 (9) ◽  
pp. 1244 ◽  
Author(s):  
Prashant Sonar ◽  
Sonsoles Garcia Santamaria ◽  
Ting Ting Lin ◽  
Alan Sellinger ◽  
Henk Bolink
Keyword(s):  
Light Emitting Diodes ◽  
Blue Emission ◽  
Organic Light Emitting Diodes ◽  
High Yield ◽  
Device Performance ◽  
Host Matrix ◽  
Maximum Brightness ◽  
Light Emitting ◽  
Organic Light ◽  
Processing Techniques

The synthesis and characterisation of 2,5-bis(5′-hexyl-[2,2′-bithiophen]-5-yl)pyridine (Th4PY) and its use as a blue emitter in organic light emitting diodes (OLEDs) is reported. Th4PY was synthesised in high yield using a straightforward Suzuki coupling route with commercially available starting materials. As Th4PY is both soluble and has low molecular weight, blue OLEDs were fabricated using both spin-coating and vacuum deposition thin film processing techniques to study the effect of processing on device performance. OLED devices using a spin-coated layer consisting of 4′,4′′-tris(N-carbazolyl)triphenylamine (TCTA) and 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD) as a host matrix together with Th4PY as emitter exhibited highly efficient sky-blue emission with a low turn-on voltage of 3 V, a maximum brightness close to 15000 cd m–2 at 8 V, and a maximum luminous efficiency of 7.4 cd A–1 (6.3 lm W–1) with CIE coordinates of x = 0.212, y = 0.320. The device performance characteristics are compared using various matrices and processing techniques. The promising sky-blue OLED performance, solution processability, and ambient stability make Th4PY a promising blue emitter for application in OLEDs.

Efficient single layer RGB phosphorescent organic light-emitting diodes

2009 ◽  
Vol 10 (6) ◽  
pp. 1146-1151 ◽  
Author(s):  
Zhiwei Liu ◽  
Michael G. Helander ◽  
Zhibin Wang ◽  
Zhenghong Lu
Keyword(s):  
Light Emitting Diodes ◽  
Single Layer ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light

3,6-Di(9-carbazolyl)-9-(2-ethylhexyl)carbazole based single-layer blue organic light emitting diodes

2011 ◽  
Vol 161 (13-14) ◽  
pp. 1343-1346 ◽  
Author(s):  
V.V. Cherpak ◽  
P.Y. Stakhira ◽  
D.Yu. Volynyuk ◽  
J. Simokaitiene ◽  
A. Tomkeviciene ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Single Layer ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light

High-Performance Solution Processed Red Hyperfluorescent OLEDs Based on Cibalackrot

2022 ◽  
Author(s):  
Nicholle R. Wallwork ◽  
Masashi Mamada ◽  
Atul Shukla ◽  
Sarah K. M. McGregor ◽  
Chihaya Adachi ◽  
...  
Keyword(s):  
High Performance ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Device Performance ◽  
Solution Processed ◽  
Light Emitting ◽  
Organic Light

Hyperfluorescent organic light-emitting diodes (OLEDs) has allowed remarkable device performances to be achieved using fluorescent emitters. Superior device performance has been realised using thermally evaporated emissive layers. However, for future...

scholarly journals Highly Efficient Single-Layer Phosphorescent Organic Light-Emitting Diodes Based on Co-Host Structure

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2029
Author(s):  
Tianyu Zhang ◽  
Asu Li ◽  
Ren Sheng ◽  
Mingyang Sun ◽  
Ping Chen
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Single Layer ◽  
Charge Carriers ◽  
Organic Light Emitting Diodes ◽  
Superior Performance ◽  
Light Emitting ◽  
Organic Light ◽  
Exciton Recombination ◽  
Host Structure

High-efficiency single-layer organic light-emitting diodes (OLEDs) based on a simple structure doped with iridium(III) bis(4-phenylthieno[3,2-c]pyridinato-N,C2′) acetylacetonate (PO-01) as emission dyes are realized, achieving maximum current efficiency (CE) and power efficiency (PE) of 37.1 cd A−1 and 33.3 lm W−1 as well as low turn-on voltage of 3.31 V. Such superior performance is mainly attributed to the employment of a uniform co-host structure and assisted charge transport property of phosphors dyes, which were in favor of the balance of charge carrier injection and transport in the single emitting layer (EML). Moreover, systematic researches on the position of exciton recombination region and the dopant effect on charge carriers were subsequently performed to better understand the operational mechanism. It could be experimentally found that the orange emitting dopants promoted the acceleration of the charge carriers transport and raised the exciton recombination efficiency, eventually leading to an excellent performance of single-layer OLEDs.

scholarly journals Highly efficient solution-processed white organic light-emitting diodes based on novel copolymer single layer

2012 ◽  
Vol 161 (23-24) ◽  
pp. 2580-2584 ◽  
Author(s):  
Carmen Coya ◽  
Angel Luis Álvarez ◽  
Mar Ramos ◽  
Rafael Gómez ◽  
Carlos Seoane ◽  
...  
Keyword(s):  
Efficient Solution ◽  
Light Emitting Diodes ◽  
Single Layer ◽  
Organic Light Emitting Diodes ◽  
Solution Processed ◽  
Light Emitting ◽  
Highly Efficient ◽  
Organic Light

Tetraphenylpyrazine decorated 1,3-di(9H-carbazol-9-yl)benzene (mCP): a new AIE-active host with enhanced performance in organic light-emitting diodes

2019 ◽  
Vol 7 (36) ◽  
pp. 11160-11166
Author(s):  
Jiali Guo ◽  
Lingxiang Pan ◽  
Bo Song ◽  
Jiabao Gu ◽  
Jiajie Zeng ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Device Performance ◽  
Light Emitting ◽  
Organic Light

Decorating a conventional mCP host with a tetraphenylpyrazine moiety generates a new AIE-active host, from which better device performance was realized.

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