Efficient Organic Light-Emitting Diode through Triplet Exciton Reharvesting by Employing Blended Electron Donor and Acceptor as the Emissive Layer

2015 ◽  
Vol 7 (45) ◽  
pp. 24983-24986 ◽  
Author(s):  
Lu Zhang ◽  
Chao Cai ◽  
King Fai Li ◽  
Hoi Lam Tam ◽  
Kin Long Chan ◽  
...  
Keyword(s):  
Electron Donor ◽  
Light Emitting Diode ◽  
Triplet Exciton ◽  
Light Emitting ◽  
Emissive Layer ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Donor And Acceptor ◽  
Electron Donor And Acceptor

scholarly journals Organic Light-Emitting Diode with Color Tunable between Bluish-White Daylight and Orange-White Dusk Hue

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Shih-Yun Liao ◽  
Sudhir Kumar ◽  
Hui-Huan Yu ◽  
Chih-Chia An ◽  
Ya-Chi Wang ◽  
...  
Keyword(s):  
Circadian Rhythm ◽  
Light Emitting Diode ◽  
Cost Effective ◽  
Color Temperature ◽  
Light Emitting ◽  
Emissive Layer ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Color Tunable ◽  
Living Organisms

The varying color of sunlight diurnally exhibits an important effect on circadian rhythm of living organisms. The bluish-white daylight that is suitable for work shows a color temperature as high as 9,000 K, while the homey orange-white dusk hue is as low as 2,000 K. We demonstrate in this report the feasibility of using organic light-emitting diode (OLED) technology to fabricate sunlight-style illumination with a very wide color temperature range. The color temperature can be tuned from 2,300 K to 9,300 K, for example, by changing the applied voltage from 3 to 11 V for the device composing red and yellow emitters in the first emissive layer and blue emitter in the second. Unlike the prior arts, the color-temperature span can be made much wider without any additional carrier modulation layer, which should enable a more cost effective fabrication. For example, the color-temperature span is 7,000 K for the above case, while it is 1,700 K upon the incorporation of a nanoscale hole modulation layer in between the two emissive layers. The reason why the present device can effectively regulate the shifting of recombination zone is because the first emissive layer itself possesses an effective hole modulation barrier of 0.2 eV. This also explains why the incorporation of an extra hole modulation layer with a 0.7 eV barrier did not help extend the desirable color-temperature span since excessive holes may be blocked.

High efficiency green phosphorescent top-emitting organic light-emitting diode with ultrathin non-doped emissive layer

2014 ◽  
Vol 15 (10) ◽  
pp. 2408-2413 ◽  
Author(s):  
Xindong Shi ◽  
Jun Liu ◽  
Jing Wang ◽  
Xinkai Wu ◽  
Youxuan Zheng ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Emissive Layer ◽  
Organic Light Emitting Diode ◽  
Organic Light

scholarly journals Virtual Screening of TADF Emitters for Single-Layer OLEDs

2021 ◽  
Vol 9 ◽  
Author(s):  
Kun-Han Lin ◽  
Gert-Jan A. H. Wetzelaer ◽  
Paul W. M. Blom ◽  
Denis Andrienko
Keyword(s):  
Light Emitting Diode ◽  
Single Layer ◽  
Delayed Fluorescence ◽  
Hole Transport ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Thermally Activated ◽  
Organic Light ◽  
Donor And Acceptor

Thermally-activated delayed fluorescence (TADF) is a concept which helps to harvest triplet excitations, boosting the efficiency of an organic light-emitting diode. TADF can be observed in molecules with spatially separated donor and acceptor groups with a reduced triplet-singlet energy level splitting. TADF materials with balanced electron and hole transport are attractive for realizing efficient single-layer organic light emitting diodes, greatly simplifying their manufacturing and improving their stability. Our goal here is to computationally screen such materials and provide a comprehensive database of compounds with a range of emission wavelengths, ionization energies, and electron affinities.

Multi emissive layer type white organic light emitting diode based on zinc metal complexes

2012 ◽  
Author(s):  
Amit Kumar ◽  
Ritu Srivastava ◽  
Arunandan Kumar ◽  
Modeeparampil N. Kamalasanan ◽  
Ishwar Singh
Keyword(s):  
Metal Complexes ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Emissive Layer ◽  
Organic Light Emitting Diode ◽  
Zinc Metal ◽  
Organic Light

Novel small-molecule electron donor for solution-processed ternary exciplex with 24% external quantum efficiency in organic light-emitting diode

2019 ◽  
Vol 6 (7) ◽  
pp. 1425-1432 ◽  
Author(s):  
Juewen Zhao ◽  
Caijun Zheng ◽  
Yu Zhou ◽  
Chuan Li ◽  
Jun Ye ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Small Molecule ◽  
Electron Donor ◽  
External Quantum Efficiency ◽  
Efficient Solution ◽  
Light Emitting Diode ◽  
Solution Processed ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light

Efficient solution-processed exciplex OLEDs were developed by incorporating a novel small molecule electron-donor and utilizing the strategy of ternary exciplexes.

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