scholarly journals Intramolecular excimer emission as a blue light source in fluorescent organic light emitting diodes: a promising molecular design

2012 ◽  
Vol 22 (15) ◽  
pp. 7149 ◽  
Author(s):  
Damien Thirion ◽  
Maxime Romain ◽  
Joëlle Rault-Berthelot ◽  
Cyril Poriel
Keyword(s):  
Light Source ◽  
Blue Light ◽  
Light Emitting Diodes ◽  
Molecular Design ◽  
Organic Light Emitting Diodes ◽  
Excimer Emission ◽  
Light Emitting ◽  
Organic Light ◽  
Intramolecular Excimer

Phosphine oxide functionalized pyrenes as efficient blue light emitting multifunctional materials for organic light emitting diodes

2015 ◽  
Vol 3 (6) ◽  
pp. 1208-1224 ◽  
Author(s):  
Godumala Mallesham ◽  
Chidirala Swetha ◽  
Surukonti Niveditha ◽  
Maneesha Esther Mohanty ◽  
Nanubolu Jagadeesh Babu ◽  
...  
Keyword(s):  
Blue Light ◽  
Phosphine Oxide ◽  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Excimer Emission ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light

Efficient electron transporting blue emitting materials obtained from excimer emission assisted by thermally activated delayed fluorescence.

scholarly journals Device Modeling of Quantum Dot–Organic Light Emitting Diodes for High Green Color Purity

2021 ◽  
Vol 11 (6) ◽  
pp. 2828
Author(s):  
Byoung-Seong Jeong
Keyword(s):  
Quantum Dot ◽  
Emission Spectrum ◽  
Blue Light ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Color Purity ◽  
Wavelength Band ◽  
Light Emitting ◽  
Green Color ◽  
Organic Light

In this study, the optimal structure for obtaining high green color purity was investigated by modeling quantum dot (QD)–organic light-emitting diodes (OLED). It was found that even if the green quantum dot (G-QD) density in the G-QD layer was 30%, the full width at half maximum (FWHM) in the green wavelength band could be minimized to achieve a sharp emission spectrum, but it was difficult to completely block the blue light leakage with the G-QD layer alone. This blue light leakage problem was solved by stacking a green color filter (G-CF) layer on top of the G-QD layer. When G-CF thickness 5 μm was stacked, blue light leakage was blocked completely, and the FWHM of the emission spectrum in the green wavelength band was minimized, resulting in high green color purity. It is expected that the overall color gamut of QD-OLED can be improved by optimizing the device that shows such excellent green color purity.

P-170: Molecular Design of Sensitizer for High Efficiency in Hyper-fluorescent Organic Light-Emitting Diodes

2018 ◽  
Vol 49 (1) ◽  
pp. 1800-1803
Author(s):  
Ji Seon Jang ◽  
Si Hyun Han ◽  
Hye Won Choi ◽  
Kyoung Soo Yook ◽  
Jun Yeob Lee
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Molecular Design ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light

Phenanthroimidazole-Based Organic Fluorophores for Organic Light-Emitting Diodes

2018 ◽  
pp. 305-388
Author(s):  
Sivakumar Vaidyanathan ◽  
Jairam Tagare
Keyword(s):  
Light Emitting Diodes ◽  
Molecular Design ◽  
Organic Light Emitting Diodes ◽  
Energy Utilization ◽  
Light Emitting ◽  
Design And Synthesis ◽  
Organic Light ◽  
Color Displays ◽  
Host Materials ◽  
Yellow Orange

Considering the imminent global energy crisis and inefficient energy utilization, energy-efficient organic light-emitting diodes (OLEDs) are considered one of the most competitive candidates for displays and particularly for future energy-saving lighting sources. Full color displays require all primary colors: red, green, and blue (RGB). In recent decades, numerous phenanthroimidazole (PI) RGB-emitting materials have been developed for efficient OLEDs. In organic electronics, considerable interest is shown on PI, due to ease in fluorophore modification. This chapter focuses on the design and synthesis of PI-based materials and their applications in OLEDs. At first, some nondoped blue, green, and yellow fluorescent materials are comprehensively studied. Then attention has been paid for typical blue, green, yellow, orange, and red PhOLEDs of PI-based fluorophores as a host materials are briefly presented. The molecular design concept, general synthetic routes for PI materials, and the applications of fluorophores in fluorescent OLEDs and host materials in PhOLEDs are reviewed.

scholarly journals Recent advances on organic blue thermally activated delayed fluorescence (TADF) emitters for organic light-emitting diodes (OLEDs)

2018 ◽  
Vol 14 ◽  
pp. 282-308 ◽  
Author(s):  
Thanh-Tuân Bui ◽  
Fabrice Goubard ◽  
Malika Ibrahim-Ouali ◽  
Didier Gigmes ◽  
Frédéric Dumur
Keyword(s):  
Molecular Orbital ◽  
Light Emitting Diodes ◽  
Molecular Design ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Recent Advances

The design of highly emissive and stable blue emitters for organic light emitting diodes (OLEDs) is still a challenge, justifying the intense research activity of the scientific community in this field. Recently, a great deal of interest has been devoted to the elaboration of emitters exhibiting a thermally activated delayed fluorescence (TADF). By a specific molecular design consisting into a minimal overlap between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) due to a spatial separation of the electron-donating and the electron-releasing parts, luminescent materials exhibiting small S1–T1 energy splitting could be obtained, enabling to thermally upconvert the electrons from the triplet to the singlet excited states by reverse intersystem crossing (RISC). By harvesting both singlet and triplet excitons for light emission, OLEDs competing and sometimes overcoming the performance of phosphorescence-based OLEDs could be fabricated, justifying the interest for this new family of materials massively popularized by Chihaya Adachi since 2012. In this review, we proposed to focus on the recent advances in the molecular design of blue TADF emitters for OLEDs during the last few years.

Molecular design of large-bandgap host materials and their application to blue phosphorescent organic light-emitting diodes

2015 ◽  
Vol 26 ◽  
pp. 218-224 ◽  
Author(s):  
Ju Sik Kang ◽  
Tae Ryang Hong ◽  
Hyung Jong Kim ◽  
Young Hoon Son ◽  
Jong-Kwan Bin ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Molecular Design ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Host Materials ◽  
Blue Phosphorescent

A replacement for incandescent bulbs: high-efficiency blue-hazard free organic light-emitting diodes

2017 ◽  
Vol 5 (1) ◽  
pp. 176-182 ◽  
Author(s):  
J. H. Jou ◽  
H. H. Yu ◽  
F. C. Tung ◽  
C. H. Chiang ◽  
Z. K. He ◽  
...  
Keyword(s):  
Energy Saving ◽  
Light Source ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light

A blue-hazard free, healthy light source will become the mainstream of future lighting wherein higher energy saving is always a must.

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