Highly soluble fluorous alkyl ether-tagged imaging materials for the photo-patterning of organic light-emitting devices

2017 ◽  
Vol 5 (4) ◽  
pp. 926-930 ◽  
Author(s):  
Jongchan Son ◽  
Hyun-Taek Oh ◽  
O Jun Kwon ◽  
Jong-Min Lim ◽  
Heeyoung Jung ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Alkyl Ether ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Organic Light Emitting Devices

A photolithographic patterning scheme for organic light-emitting diode (OLED) pixels was proposed, requiring highly soluble imaging materials in fluorous solvents.

scholarly journals Near infrared organic light emitting devices based on a new erbium(iii) β-diketonate complex: synthesis and optoelectronic investigations

RSC Advances ◽  
2017 ◽  
Vol 7 (30) ◽  
pp. 18239-18251 ◽  
Author(s):  
Zubair Ahmed ◽  
Rian E. Aderne ◽  
Jiang Kai ◽  
Jackson A. L. C. Resende ◽  
Helmut I. Padilla-Chavarría ◽  
...  
Keyword(s):  
Near Infrared ◽  
Light Emitting Diode ◽  
Coordinate Structure ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Infra Red ◽  
Organic Light Emitting Devices

This paper deals with the synthesis of a new near infra-red emitting Er(iii) β-diketonate complex of low coordinate structure, its characterisation and fabrication of organic light emitting diode using the complex as emitting layer.

High Brightness White Organic Light Emitting Devices Employing Phosphorescent Iridium Complex as RGB Dopants

2007 ◽  
Vol 364-366 ◽  
pp. 1072-1076
Author(s):  
Rui Li Song ◽  
Yu Duan
Keyword(s):  
Power Efficiency ◽  
Light Emitting Diode ◽  
Iridium Complex ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Color Mixing ◽  
Coordinate Changes ◽  
Cie Chromaticity

An efficient phosphorescent white organic light-emitting diode (WOLED) was realized by using a bright blue-emitting layer, iridium (III) bis [(4, 6-di-fluoropheny)-pyridinato-N, C2’] picolinate doped 4.4’-bis (9-carbazolyl)-2, 2’-dimethyl-biphenyl, together with tris (2- Phenylpyridine) iridium and bis (1-phenyl-isoquinoline) acetylacetonate iridium (III) were codoped into 4,4’-N,N’-dicarbazole-biphenyl layer to provide blue, green, and red emission for color mixing. The device emission color was controlled by varying dopant concentrations and the thickness of blue and green-red layers as well as tuning the thickness of exciton-blocking layer. The maximum luminance and power efficiency of the WOLED were 37100cd/m2 at 17 V and 7.37lm/W at 5V, respectively. The Commission Internationale de 1’Eclairage (CIE) chromaticity coordinate changes from (0.41, 0.42) to (0.37, 0.39) when the luminance rangeed from 1000cd/m2 to 30000cd/m2.

Tri-Metal Layered Semitransparent Electrode for Red Phosphorescent Organic Light-Emitting Diodes

2015 ◽  
Vol 15 (10) ◽  
pp. 8144-8148 ◽  
Author(s):  
Jae Woo Lee ◽  
Ho Won Lee ◽  
Song Eun Lee ◽  
Hyung Jin Yang ◽  
Sung Kyu Lee ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Glass Substrate ◽  
Light Emitting Diode ◽  
Metal Layer ◽  
Flexible Substrate ◽  
Flexible Display ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light Emitting Diode ◽  
Organic Light

In this paper, we fabricated tri-metal layered thin film semitransparent electrodes consisting of a thin conductive metal layer, sandwiched between two nickel layers. An equal red phosphorescent organic light-emitting diode (PHOLED) structure was deposited on the anodes of indium tin oxide (ITO) and three types of tri-metal layers (Ni/Al/Ni, Ni/Cu/Ni, and Ni/Ag/Ni, thickness of 3/7/3 nm in common) on a glass substrate. The optical and electrical performances of the device using Ni/Ag/Ni were improved more than the performances of the other devices due to the micro-cavity effect in accordance with the various electrode characteristics. Moreover, we fabricated the same red PHOLED structures on a flexible substrate, as a consequence, showed competitive emission characteristics compared to the devices fabricated on a glass substrate. Therefore, this study could succeed to additional research on flexible display panel and light-emitting devices with ITO-free electrodes.

A life estimation model applied to organic light-emitting diodes

2018 ◽  
Vol 51 (5) ◽  
pp. 764-773
Author(s):  
JP Zhang ◽  
Y Zong ◽  
Y Meng ◽  
WG Pan ◽  
JS Tang
Keyword(s):  
Light Emitting Diodes ◽  
Light Emitting Diode ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Decay Data ◽  
Light Emitting Devices ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Extrapolation Model ◽  
Accelerated Life

For predicting life for light-emitting devices quickly and accurately, a novel life prediction model, namely an extrapolation model of accelerated life and stress, has been proposed. In this model, a Weibull function is employed to fit luminance decay data under multiple groups of accelerated stresses, and the corresponding accelerated life is obtained. By determination coefficients and root mean square errors, a power function is determined as an extrapolated function to describe the relationship between accelerated life and stress and the life of the light-emitting devices. For organic light-emitting diodes, three groups of constant-stress accelerated degradation tests were conducted by increasing current stress. An extrapolation model of accelerated life and stress was applied to process the collected luminance decay data and was evaluated by a careful comparison with organic light-emitting diode life. The results indicate that the self-designed experimental scheme for organic light-emitting diode is feasible and versatile; the predicted life is 17,113 hours, which is close to the service life derived from user feedback, and the relative error is only 2.2%. This shows that the extrapolation model of accelerated life and stress has high precision; the model reveals the expected law of luminance changing with time and intuitively depicts the life characteristics under accelerated stresses without conventional life tests. This will pave the way for a new method to predict and evaluate the life of modern light-emitting devices.

Tetraphenylmethane-Based 1,3,4-Oxadiazole as Electron Transporting Materials in Organic Light-Emitting Devices

1999 ◽  
Vol 598 ◽  
Author(s):  
Chin-Ti Chen ◽  
Tzu-Yao J. Lin ◽  
Hsiu-Chih Yeh ◽  
Li-Hsin Jan ◽  
Easwaramoorthy Balasubramaniam ◽  
...  
Keyword(s):  
Glass Phase ◽  
Molecular Design ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Current Voltage ◽  
Electron Transporting Layer ◽  
Current Voltage Characteristics

ABSTRACTA series of tetrahedral tetramers of 2,5-diphenyl substituted 1,3,4-oxadiazole compounds were synthesized and characterized for electron-transporting layer (ETL) in organic light-emitting diode (OLED). The multiple-branch design of the oxadiazole tetramers intends to increase the melting temperature and to generate glass phase of the low molar mass derivative such as 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD). We observed temperatures of the glass phase transition for the oxadiazole tetramer with appropriate peripheral substituents, indicative of amorphous characteristics of the molecule in spite of highly symmetrical molecular framework. The luminescence-current-voltage characteristics of multilayer OLED devices containing the oxadiazole tetramer or PBD as ETL were examined to evaluate the efficiency of our multiple-branch molecular design.

scholarly journals Carbon Dots as A Sustainable New Platform for Organic Light Emitting Diode

2020 ◽  
Author(s):  
Paola Lagonegro ◽  
Umberto Giovanella ◽  
Mariacecilia Pasini
Keyword(s):  
Carbon Dots ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light Emitting Diode ◽  
Research Outcomes ◽  
Organic Light ◽  
The Impact ◽  
Organic Resources ◽  
Safe By Design

In the last 10 years, carbon dots (CDs) synthesized from renewable organic resources have been gathered a considerable amount of attention in different fields for their peculiar photoluminescent properties. Moreover, the synthesis of CDs fully responds to the principles of the circular chemistry and the concept of safe-by-design. This review will focus on the different strategies for the incorporation of CDs in organic light-emitting devices (OLEDs) and on the study of the impact of CDs properties on the OLEDs performance. The main current research outcomes and highlights are summarized to guide users towards the fully exploitation of use these materials in optoelectronic applications.

Highly efficient and stable tandem organic light-emitting devices based on HAT-CN/HAT-CN:TAPC/TAPC as a charge generation layer

2015 ◽  
Vol 3 (26) ◽  
pp. 6809-6814 ◽  
Author(s):  
Yanfeng Dai ◽  
Hongmei Zhang ◽  
Zhiqiang Zhang ◽  
Yipeng Liu ◽  
Jiangshan Chen ◽  
...  
Keyword(s):  
Effective Charge ◽  
High Efficiency ◽  
Light Emitting Diode ◽  
Charge Generation ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Organic Acceptor ◽  
A Charge

We demonstrated an effective charge-generation layer (CGL) composition consisting of three layers: an organic acceptor material HAT-CN, HAT-CN blended with an organic donor material TAPC and TAPC, to fabricate a high efficiency tandem organic light-emitting diode (OLED).

scholarly journals Carbon Dots as a Sustainable New Platform for Organic Light Emitting Diode

Coatings ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 5
Author(s):  
Paola Lagonegro ◽  
Umberto Giovanella ◽  
Mariacecilia Pasini
Keyword(s):  
Carbon Dots ◽  
Raw Materials ◽  
Light Emitting Diode ◽  
Renewable Raw Materials ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
The Impact ◽  
Safe By Design

Over the past 10 years, carbon dots (CDs) synthesized from renewable raw materials have received considerable attention in several fields for their unique photoluminescent properties. Moreover, the synthesis of CDs fully responds to the principles of circular chemistry and the concept of safe-by-design. This review will focus on the different strategies for incorporation of CDs in organic light-emitting devices (OLEDs) and on the study of the impact of CDs properties on OLED performance. The main current research outcomes and highlights are summarized to guide users towards full exploitation of these materials in optoelectronic applications.

scholarly journals A substrateless, flexible, and water-resistant organic light-emitting diode

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Changmin Keum ◽  
Caroline Murawski ◽  
Emily Archer ◽  
Seonil Kwon ◽  
Andreas Mischok ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Chemical Vapour ◽  
Parylene C ◽  
Flexible Displays ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light Emitting Diode ◽  
Scale Thickness ◽  
Organic Light ◽  
Wide Range

AbstractDespite widespread interest, ultrathin and highly flexible light-emitting devices that can be seamlessly integrated and used for flexible displays, wearables, and as bioimplants remain elusive. Organic light-emitting diodes (OLEDs) with µm-scale thickness and exceptional flexibility have been demonstrated but show insufficient stability in air and moist environments due to a lack of suitable encapsulation barriers. Here, we demonstrate an efficient and stable OLED with a total thickness of ≈ 12 µm that can be fully immersed in water or cell nutrient media for weeks without suffering substantial degradation. The active layers of the device are embedded between conformal barriers formed by alternating layers of parylene-C and metal oxides that are deposited through a low temperature chemical vapour process. These barriers also confer stability of the OLED to repeated bending and to extensive postprocessing, e.g. via reactive gas plasmas, organic solvents, and photolithography. This unprecedented robustness opens up a wide range of novel possibilities for ultrathin OLEDs.

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