scholarly journals Achieving remarkable mechanochromism and white-light emission with thermally activated delayed fluorescence through the molecular heredity principle

2016 ◽  
Vol 7 (3) ◽  
pp. 2201-2206 ◽  
Author(s):  
Bingjia Xu ◽  
Yingxiao Mu ◽  
Zhu Mao ◽  
Zongliang Xie ◽  
Haozhong Wu ◽  
...  
Keyword(s):  
White Light ◽  
Light Emission ◽  
Delayed Fluorescence ◽  
White Light Emission ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated

An asymmetric molecule created by molecular heredity exhibits remarkable mechanochromism and white-light emission.

A sky blue thermally activated delayed fluorescence emitter to achieve efficient white light emission through in situ metal complex formation

2019 ◽  
Vol 7 (11) ◽  
pp. 3146-3149 ◽  
Author(s):  
Yuki Kato ◽  
Hisahiro Sasabe ◽  
Yuya Hayasaka ◽  
Yuichiro Watanabe ◽  
Hiroki Arai ◽  
...  
Keyword(s):  
Complex Formation ◽  
Metal Complex ◽  
White Light ◽  
Light Emission ◽  
Delayed Fluorescence ◽  
White Light Emission ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated

A pyradine-containing sky blue fluorescent emitter can achieve efficient white light emission through in situ metal complex formation.

Highly efficient white light-emitting diodes with a bi-component emitting layer based on blue and yellow thermally activated delayed fluorescence emitters

2018 ◽  
Vol 6 (12) ◽  
pp. 2951-2956 ◽  
Author(s):  
Yongzhen Chen ◽  
Shengyong Li ◽  
Taiping Hu ◽  
Xiaofang Wei ◽  
Zhiyi Li ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Light Emission ◽  
Delayed Fluorescence ◽  
White Light Emission ◽  
White Led ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
White Light Emitting Diodes

A white LED with a bi-component light emitting layer is reported providing white light emission with a CIE of (0.38, 0.40), a CRI of 71, and a maximum EQE of 12.5%. These are among the best for bi-component based devices.

scholarly journals White light emitting diode based on purely organic fluorescent to modern thermally activated delayed fluorescence (TADF) and perovskite materials

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Dipjyoti Das ◽  
Peddaboodi Gopikrishna ◽  
Debasish Barman ◽  
Ramesh Babu Yathirajula ◽  
Parameswar Krishnan Iyer
Keyword(s):  
White Light ◽  
Light Emitting Diode ◽  
Solution Process ◽  
Delayed Fluorescence ◽  
Organic Polymer ◽  
Modern Concept ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Synthesis Strategy

Abstract White organic/polymer light emitting diode (WOLED/WPLED) processed from solution has attracted significant research interest in recent years due to their low device production cost, device flexibility, easy fabrication over large area including roll to roll and ability to print in various designs and shapes providing enormous design possibilities. Although WOLEDs fabricated using solution process lack their thermally evaporated counterparts in terms of device efficiency, remarkable progress has been made in this regard in recent years by utilizing new materials and device structures. In the present review, we have summarized and extrapolated an excellent association of old and modern concept of cost-effective materials and device structure for realization of white light. In particular, this article demonstrated and focused on design, and development of novel synthesis strategy, mechanistic insights and device engineering for solution process low cost WOLEDs device. Herein, an overview of the prevailing routes towards white light emitting devices (WLEDs) and corresponding materials used, including polymer based WLED, small molecules emitters based thermally activated delayed fluorescence (TADF), perovskite light-emitting diodes (PeLEDs) and hybrid materials based LEDs, color down-converting coatings with corresponding best efficiencies ever realized. We presume that this exhaustive review on WLEDs will offer a broad overview of the latest developments on white SSL and stonework the approach en route for innovations in the immediate future.

scholarly journals Fabrication of a Solution-Processed White Light Emitting Diode Containing a Single Dimeric Copper(I) Emitter Featuring Combined TADF and Phosphorescence

Micromachines ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1500
Author(s):  
Gang Cheng ◽  
Dongling Zhou ◽  
Uwe Monkowius ◽  
Hartmut Yersin
Keyword(s):  
White Light ◽  
Light Emitting Diode ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Device Structure ◽  
Solution Processed ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light

Luminescent copper(I) complexes showing thermally activated delayed fluorescence (TADF) have developed to attractive emitter materials for organic light emitting diodes (OLEDs). Here, we study the brightly luminescent dimer Cu2Cl2(P∩N)2 (P∩N = diphenylphosphanyl-6-methyl-pyridine), which shows both TADF and phosphorescence at ambient temperature. A solution-processed OLED with a device structure ITO/PEDOT:PSS/PYD2: Cu2Cl2(P∩N)2/DPEPO (10 nm)/TPBi (40 nm)/LiF (1.2 nm)/Al (100 nm) shows warm white emission with moderate external quantum efficiency (EQE). Methods for EQE increase strategies are discussed.

Efficient white light-emitting polymers from dual thermally activated delayed fluorescence chromophores for non-doped solution processed white electroluminescent devices

2021 ◽  
Vol 12 (7) ◽  
pp. 1030-1039
Author(s):  
Praetip Khammultri ◽  
Wipaporn Kitisriworaphan ◽  
Pongsakorn Chasing ◽  
Supawadee Namuangruk ◽  
Taweesak Sudyoadsuk ◽  
...  
Keyword(s):  
White Light ◽  
Delayed Fluorescence ◽  
Maximum Luminance ◽  
Solution Processed ◽  
Thermally Activated Delayed Fluorescence ◽  
Electroluminescent Devices ◽  
Light Emitting ◽  
White Emission ◽  
Thermally Activated ◽  
Luminance Efficiency

Conjugated TADF copolymers comprised of two TADF molecules linked with carbazole exhibited stable pure white emission from non-doped OLEDs with CIE coordinates (0.32, 0.35), a maximum luminance efficiency of 9.13 cd A−1, and a maximum EQE of 4.17%.

peri-Acenoacene Molecules: Tuning of the Singlet and Triplet Excitation Energies by Modifying their Radical Character

2021 ◽  
Author(s):  
Alicia Omist ◽  
Gaetano Ricci ◽  
Amel Derradji ◽  
Ángel J. José Pérez-Jiménez ◽  
Emilio San Fabián ◽  
...  
Keyword(s):  
Light Emission ◽  
Energy Difference ◽  
Delayed Fluorescence ◽  
Excitation Energies ◽  
Thermally Activated Delayed Fluorescence ◽  
Triplet Excitation ◽  
Thermally Activated ◽  
Radical Character ◽  
Triplet Excitons

The energy difference between singlet and triplet excitons, or ΔEST, is a key magnitude for novel light-emission mechanisms (i.e., TADF or Thermally Activated Delayed Fluorescence) or other photoactivated processes. We...

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