P-161: White Organic Light-emitting Diodes with Nearly 100% Internal Quantum Efficiency

2010 ◽  
Vol 41 (1) ◽  
pp. 1853
Author(s):  
Ji Hoon Seo ◽  
Jung Sun Park ◽  
Seok Jae Lee ◽  
Ja Ryong Koo ◽  
Bo Min Seo ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Light Emitting Diodes ◽  
Internal Quantum Efficiency ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light

White organic light-emitting diodes showing nearly 100% internal quantum efficiency

2010 ◽  
Vol 11 (11) ◽  
pp. 1759-1766 ◽  
Author(s):  
Ji Hoon Seo ◽  
Seok Jae Lee ◽  
Bo Min Seo ◽  
Se Jin Moon ◽  
Kum Hee Lee ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Light Emitting Diodes ◽  
Internal Quantum Efficiency ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light

Analysis of the external and internal quantum efficiency of multi-emitter, white organic light emitting diodes

2012 ◽  
Vol 101 (14) ◽  
pp. 143304 ◽  
Author(s):  
Mauro Furno ◽  
Thomas C. Rosenow ◽  
Malte C. Gather ◽  
Björn Lüssem ◽  
Karl Leo
Keyword(s):  
Quantum Efficiency ◽  
Light Emitting Diodes ◽  
Internal Quantum Efficiency ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light

Organic Light - Emitting Diodes and their Applications

2014 ◽  
Vol 357 ◽  
pp. 29-93 ◽  
Author(s):  
V.K. Chandra ◽  
B.P. Chandra ◽  
Piyush Jha
Keyword(s):  
Quantum Efficiency ◽  
Organic Material ◽  
Organic Molecules ◽  
Light Emitting Diodes ◽  
Internal Quantum Efficiency ◽  
Charge Carriers ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Triplet Excitons

Organic light emitting diodes (OLEDs) have been the focus of intense study since the late 1980s, when the low voltage organic electroluminescence in small organic molecules such as Alq3, and large organic molecules such as polymers (PPV), was reported. Since that time, research has continued to demonstrate the potential of OLEDs as viable systems for displays and eco-friendly lighting applications. OLEDs offer full colour display, reduced manufacturing cost, larger viewing angle, more flexible, lower power consumption, better contrast, slimmer, etc. which help in replacing the other technologies such as LCD. The operation of OLEDs involves injection of charge carriers into organic semiconducting layers, recombination of charge carriers, formation of singlet and triplet excitons, and emission of light during decay of excitons. The maximum internal quantum efficiency of fluorescent OLEDs consisting of the emissive layer of fluorescent organic material is 25% because in this case only the 25% singlet excitons can emit light. The maximum internal quantum efficiency of phosphorescent OLEDs consisting of the emissive layer of fluorescent organic material mixed with phosphorescent material of heavy metal complexes such as platinum complexes, iridium complexes, etc. is nearly 100% because in this case both the 25% singlet excitons and 75% triplet excitons emit light. Recently, a new class of OLEDs based on thermally activated delayed fluorescence (TADF) has been reported, in which the energy gap between the singlet and triplet excited states is minimized by design, thereby promoting highly efficient spin up-conversion from non-radiative triplet states to radiative singlet states while maintaining high radiative decay rates of more than 106decays per second. These molecules harness both singlet and triplet excitons for light emission through fluorescence decay channels and provides an intrinsic fluorescence efficiency in excess of 90 per cent and a very high external electroluminescence efficiency of more than 19 per cent, which is comparable to that achieved in high-efficiency phosphorescence-based OLEDs.The OLED technology can be used to make screens large enough for laptop, cell phones, desktop computers, televisions, etc. OLED materials could someday be applied to plastic and other materials to create wall-size video panels, roll-up screens for laptops, automotive displays, and even head wearable displays. Presently, the OLEDs are opening up completely new design possibilities for lighting in the world of tomorrow whereby the offices and living rooms could be illuminated by lighting panels on the ceiling. The present paper describes the salient features of OLEDs and discusses the applications of OLEDs in displays and solid state lighting devices. Finally, the challenges in the field of OLEDs are explored. Contents of Paper

scholarly journals Active refractive index control using a stably evaporable perfluororesin for high-outcoupling-efficiency organic light-emitting diodes

2021 ◽  
Author(s):  
Daisuke Yokoyama ◽  
Tatsuki Sasaki ◽  
Yasutaka Suzuki ◽  
Takefumi Abe ◽  
Kaori Tsuruoka ◽  
...  
Keyword(s):  
Refractive Index ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Light Emitting Diodes ◽  
Internal Quantum Efficiency ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light

The internal quantum efficiency of organic light-emitting diodes (OLEDs) has reached nearly 100%, and thus further improvement in the external quantum efficiency can be achieved only through outcoupling enhancement. However,...

scholarly journals Ladder-like energy-relaying exciplex enables 100% internal quantum efficiency of white TADF-based diodes in a single emissive layer

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Chunmiao Han ◽  
Ruiming Du ◽  
Hui Xu ◽  
Sanyang Han ◽  
Peng Ma ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Light Emitting Diodes ◽  
Internal Quantum Efficiency ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Emissive Layer ◽  
Thermally Activated ◽  
Organic Light

AbstractDevelopment of white organic light-emitting diodes based on purely thermally activated delayed fluorescence with a single-emissive-layer configuration has been a formidable challenge. Here, we report the rational design of a donor-acceptor energy-relaying exciplex and its utility in fabricating single-emissive-layer, thermally activated delayed fluorescence-based white organic light-emitting diodes that exhibit 100% internal quantum efficiency, 108.2 lm W−1 power efficiency, and 32.7% external quantum efficiency. This strategy enables thin-film fabrication of an 8 cm × 8 cm thermally activated delayed fluorescence white organic light-emitting diodes (10 inch2) prototype with 82.7 lm W−1 power efficiency and 25.0% external quantum efficiency. Introduction of a phosphine oxide-based acceptor with a steric group to the exciplex limits donor-acceptor triplet coupling, providing dual levels of high-lying and low-lying triplet energy. Transient spectroscopic characterizations confirm that a ladder-like energy relaying occurs from the high-lying triplet level of the exciplex to a blue emitter, then to the low-lying triplet level of the phosphine oxide acceptor, and ultimately to the yellow emitter. Our results demonstrate the broad applicability of energy relaying in multicomponent systems for exciton harvesting, providing opportunities for the development of third-generation white organic light-emitting diode light sources.

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