Abstract
A new solution processable cruciform tetraphenylsilane-based bipolar host material, bis(4-(9H-carbazol-9-yl)phenyl)bis(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)silane (SiCT), was designed and synthesized. Two carbazoles as donors and two diphenyl triazine moieties as acceptors were tethered to the tetraphenylsilane. SiCT showed great solubility in common organic solvents, high thermal stability, high triplet energy (T 1 ∼3.0 eV), and a superior bipolar electronic nature, which are sufficient for it to function as a host material in thermally activated delayed fluorescence organic light emitting diodes (TADF-OLEDs). Consequently, the solution-processed green TADF-OLEDs employed SiCT as a bipolar host exhibited a low turn-on voltage and high external quantum efficiency (EQE) of 19.17% with a high power efficiency (PE) of 41.13 lm W −1 , while control device based-on SiC as unipolar host showed a low EQE of 12.74% with a low PE of 16.13 lm W −1 . This work highlights the potential of a bipolar tetraphenylsilane derivative as a host material in solution-processable green TADF-OLEDs.
| Original language | English |
|---|---|
| Pages (from-to) | 120-126 |
| Number of pages | 7 |
| Journal | Dyes and Pigments |
| Volume | 167 |
| DOIs | |
| Publication status | Published - 2019 Aug 1 |
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Keywords
- Carbazole
- Organic light emitting diode
- Solution process
- Tetraphenylsilane
- Thermally activated delayed fluorescence
- Triphenyltriazine
ASJC Scopus subject areas
- Chemical Engineering(all)
- Process Chemistry and Technology
Cite this
2D-σ-2A type cruciform host material with silane core for highly efficient solution-processable green thermally activated delayed fluorescence organic light emitting diodes. / Choi, Suna; Yoon, Ji Won; Godumala, Mallesham; Kim, Hyung Jong; Park, Su Hong; Kim, Seong Keun; Lee, Hyuna; Kwon, Jang Hyuk; Cho, Min Ju; Choi, Dong Hoon.
In: Dyes and Pigments, Vol. 167, 01.08.2019, p. 120-126.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - 2D-σ-2A type cruciform host material with silane core for highly efficient solution-processable green thermally activated delayed fluorescence organic light emitting diodes
AU - Choi, Suna
AU - Yoon, Ji Won
AU - Godumala, Mallesham
AU - Kim, Hyung Jong
AU - Park, Su Hong
AU - Kim, Seong Keun
AU - Lee, Hyuna
AU - Kwon, Jang Hyuk
AU - Cho, Min Ju
AU - Choi, Dong Hoon
PY - 2019/8/1
Y1 - 2019/8/1
N2 - A new solution processable cruciform tetraphenylsilane-based bipolar host material, bis(4-(9H-carbazol-9-yl)phenyl)bis(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)silane (SiCT), was designed and synthesized. Two carbazoles as donors and two diphenyl triazine moieties as acceptors were tethered to the tetraphenylsilane. SiCT showed great solubility in common organic solvents, high thermal stability, high triplet energy (T 1 ∼3.0 eV), and a superior bipolar electronic nature, which are sufficient for it to function as a host material in thermally activated delayed fluorescence organic light emitting diodes (TADF-OLEDs). Consequently, the solution-processed green TADF-OLEDs employed SiCT as a bipolar host exhibited a low turn-on voltage and high external quantum efficiency (EQE) of 19.17% with a high power efficiency (PE) of 41.13 lm W −1 , while control device based-on SiC as unipolar host showed a low EQE of 12.74% with a low PE of 16.13 lm W −1 . This work highlights the potential of a bipolar tetraphenylsilane derivative as a host material in solution-processable green TADF-OLEDs.
AB - A new solution processable cruciform tetraphenylsilane-based bipolar host material, bis(4-(9H-carbazol-9-yl)phenyl)bis(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)silane (SiCT), was designed and synthesized. Two carbazoles as donors and two diphenyl triazine moieties as acceptors were tethered to the tetraphenylsilane. SiCT showed great solubility in common organic solvents, high thermal stability, high triplet energy (T 1 ∼3.0 eV), and a superior bipolar electronic nature, which are sufficient for it to function as a host material in thermally activated delayed fluorescence organic light emitting diodes (TADF-OLEDs). Consequently, the solution-processed green TADF-OLEDs employed SiCT as a bipolar host exhibited a low turn-on voltage and high external quantum efficiency (EQE) of 19.17% with a high power efficiency (PE) of 41.13 lm W −1 , while control device based-on SiC as unipolar host showed a low EQE of 12.74% with a low PE of 16.13 lm W −1 . This work highlights the potential of a bipolar tetraphenylsilane derivative as a host material in solution-processable green TADF-OLEDs.
KW - Carbazole
KW - Organic light emitting diode
KW - Solution process
KW - Tetraphenylsilane
KW - Thermally activated delayed fluorescence
KW - Triphenyltriazine
UR - http://www.scopus.com/inward/record.url?scp=85064214379&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85064214379&partnerID=8YFLogxK
U2 - 10.1016/j.dyepig.2019.04.014
DO - 10.1016/j.dyepig.2019.04.014
M3 - Article
VL - 167
SP - 120
EP - 126
JO - Dyes and Pigments
JF - Dyes and Pigments
SN - 0143-7208
ER -