Results 281 to 290 of about 223,988 (345)

Dissociation of excitons in organic light-emitting diodes

Microelectronics Journal, 2007
In this paper, the dissociation of excitons in both doped and undoped organic light-emitting diodes is investigated in detail by means of electric-field-induced photoluminescence quenching. The results show that the doped devices demonstrate lower quenching than that of undoped device.
Jin Zhao Huang, Zheng Xu, Fujun Zhang 0003, Su Ling Zhao, Yuan Li, Lin Song, Xu Rong Xu   +6 more
openaire   +1 more source

Carbazole-Based DABNA Analogs as Highly Efficient Thermally Activated Delayed Fluorescence Materials for Narrowband Organic Light-Emitting Diodes.

Angewandte Chemie, 2020
Carbazole-based DABNA analogs ( CzDABNA s) were synthesized from triarylamine by regioselective one-shot single and double borylation. The reaction proceeded selectively at the ortho position of the carbazolyl group, where the highest occupied molecular ...
S. Oda, W. Kumano, Toshiki Hama, Ryosuke Kawasumi, Kazuki Yoshiura, T. Hatakeyama   +5 more
semanticscholar   +1 more source

Dendritic macromolecules for organic light-emitting diodes

Chemical Society Reviews, 2008
The general concepts, design criteria, and physical parameters, such as component placement and electroluminescence, that relate to the construction of OLED devices are described, followed by a discussion of the current literature detailing the use of branched and dendritic materials as the key electroluminescent elements of single- and multi-layered ...
Seok-Ho, Hwang, Charles N, Moorefield, George R, Newkome   +2 more
openaire   +2 more sources

Degradation mechanisms in organic light emitting diodes

Synthetic Metals, 2000
Lifetime measurement results on organic light emitting diodes (OLEDs) are presented and analyzed. The drive voltage tends to increase and the luminance tends to decrease with operating time. Upon the reversal of the polarity of the external field, the voltage trends are reversed almost completely and the luminance trends undergo weak changes.
Shen, Jun, Wang, D., Langlois, E., Barrow, William A., Green, Patrick J., Tang, Ching Wan, Shi, Jianmin   +6 more
openaire   +2 more sources

Recent Progress of the Lifetime of Organic Light‐Emitting Diodes Based on Thermally Activated Delayed Fluorescent Material

Advances in Materials, 2019
Recently, the external quantum efficiency and lifetime of organic light‐emitting diodes (OLEDs) have been dramatically upgraded due to development of organic materials and device structure. In particular, an intramolecular or intermolecular complex based
S. Jeon, Ha Lim Lee, K. Yook, Jun Yeob Lee   +3 more
semanticscholar   +1 more source

Organic Light Emitting Diodes

2012
Introduction, Luiz Pereira The Organic Light Emitting Devices: The basics, Luiz Pereira Measuring the Optical and Electrical Properties of OLEDs, Luiz Pereira Rare Earth Complexes: The Search for Quasi-Monochromatic OLEDs, Luiz Pereira Transition Metal Complexes: The Path to High Brightness OLEDs, Luiz Pereira Synthesis of Light emitting Complexes ...
openaire   +1 more source

Blue light emitting naphthalimides for organic light emitting diodes

AIP Conference Proceedings, 2013
The photophysical, electrochemical, surface morphology and thermal properties of two novel blue lightemitting materials were studied. Results indicate that the molecules offer potential as non-doping light-emitting materials with good electron injection capabilities for fabrication of blue organic light-emitting diodes.
Hidayath Ulla, B. Garudachar, M. N. Satyanarayan, G. Umesh, A. M. Isloor   +4 more
openaire   +1 more source

Organic light emitting diodes.

2004
A method of fabricating an OLED element or display having two or more OLED layers is described entailing providing a blocking layer by printing with an ink in a desired pattern between two of the OLED layers, whereby, in use, conduction across the OLED element or display is reduced in the area of the pattern, wherein the ink is colored to increase ...
openaire   +3 more sources

Exceptionally stable blue phosphorescent organic light-emitting diodes

Nature Photonics, 2022
J. Sun, Heechoon Ahn, Sunwoo Kang, Soo-Byung Ko, Dayoon Song, Hyun Ah Um, Sungbum Kim, Y. Lee, P. Jeon, Seok-Hwan Hwang, Youngmin You, Changwoong Chu, Sunghan Kim   +12 more
semanticscholar   +1 more source

Photochemistry of Organic Light-Emitting Diodes

AIP Conference Proceedings, 2007
The optical properties and excited‐state geometries of some organic light‐emitting diodes have been investigated by the SAC‐CI method. The absorption and emission spectra have been predicted in high accuracy and the chain‐length dependence of transition energies has been precisely reproduced.
Masahiro Ehara, Hiroshi Nakatsuji, Theodore E. Simos, George Maroulis   +3 more
openaire   +1 more source