scholarly journals Highly efficient hybrid warm white organic light-emitting diodes using a blue thermally activated delayed fluorescence emitter: exploiting the external heavy-atom effect

2015 ◽  
Vol 4 (1) ◽  
pp. e232-e232 ◽  
Author(s):  
Dongdong Zhang ◽  
Lian Duan ◽  
Yunge Zhang ◽  
Minghan Cai ◽  
Deqiang Zhang ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Heavy Atom ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Heavy Atom Effect ◽  
Thermally Activated ◽  
Organic Light ◽  
Atom Effect

scholarly journals Heavy-Atom Effect Promotes Multi-Resonance Thermally Activated Delayed Fluorescence

2021 ◽  
Author(s):  
Tao Hua ◽  
Lisi Zhan ◽  
Nengquan Li ◽  
Zhongyan Huang ◽  
Xiaosong Cao ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Heavy Atom ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Heavy Atom Effect ◽  
Thermally Activated ◽  
Organic Light ◽  
Atom Effect

As one type of latest emitters with simultaneous high efficiency and color-purity, the development of multi-resonance thermally activated delayed fluorescence (MR-TADF) materials represents an important advancement for organic light-emitting diodes (OLEDs). We herein present a new strategy to improve the performance of MR-TADF emitters by fusing sulfur element into the B-N based framework, aiming to utilize the non-metal heavy-atom effect in accelerating the reverse intersystem crossing (RISC) process of the emitter. Two compounds, namely 2PTZBN and 2PXZBN, were developed in this work through rigidifying the DABNA-1 skeleton by sulfur or oxygen atoms. The theoretical calculations and photoluminescence studies revealed that the sulfur-incorporated 2PTZBN enabled considerable rate constant of RISC (<i>k</i><sub>RISC</sub>) up to 2.8 × 10<sup>5</sup> s<sup>-1</sup> in toluene due to larger spin-orbital coupling (SOC) values and smaller singlet-triplet energy splitting (Δ<i>E</i><sub>ST</sub>) compared with 2PXZBN. Consequently, organic light-emitting diodes based on 2PTZBN exhibited highly efficient green emission with maximum external quantum efficiency (EQE) of 25.5%.

scholarly journals Heavy-Atom Effect Promotes Multi-Resonance Thermally Activated Delayed Fluorescence

2021 ◽  
Author(s):  
Tao Hua ◽  
Lisi Zhan ◽  
Nengquan Li ◽  
Zhongyan Huang ◽  
Xiaosong Cao ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Heavy Atom ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Heavy Atom Effect ◽  
Thermally Activated ◽  
Organic Light ◽  
Atom Effect

As one type of latest emitters with simultaneous high efficiency and color-purity, the development of multi-resonance thermally activated delayed fluorescence (MR-TADF) materials represents an important advancement for organic light-emitting diodes (OLEDs). We herein present a new strategy to improve the performance of MR-TADF emitters by fusing sulfur element into the B-N based framework, aiming to utilize the non-metal heavy-atom effect in accelerating the reverse intersystem crossing (RISC) process of the emitter. Two compounds, namely 2PTZBN and 2PXZBN, were developed in this work through rigidifying the DABNA-1 skeleton by sulfur or oxygen atoms. The theoretical calculations and photoluminescence studies revealed that the sulfur-incorporated 2PTZBN enabled considerable rate constant of RISC (<i>k</i><sub>RISC</sub>) up to 2.8 × 10<sup>5</sup> s<sup>-1</sup> in toluene due to larger spin-orbital coupling (SOC) values and smaller singlet-triplet energy splitting (Δ<i>E</i><sub>ST</sub>) compared with 2PXZBN. Consequently, organic light-emitting diodes based on 2PTZBN exhibited highly efficient green emission with maximum external quantum efficiency (EQE) of 25.5%.

Lowest unoccupied molecular orbital managing function of CN-substituted dibenzofuran in high triplet energy hosts for blue thermally-activated delayed fluorescent organic light-emitting diodes

2021 ◽  
Author(s):  
Sung Yong Byun ◽  
Kyung Hyung Lee ◽  
Jun Yeob Lee
Keyword(s):  
Molecular Orbital ◽  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Triplet Energy ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Lowest Unoccupied Molecular Orbital

The effect of lowest unoccupied molecular orbital (LUMO) management of high triplet energy electron transport type hosts on the device performance of blue thermally-activated delayed fluorescence (TADF) organic light-emitting diodes...

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