High-Efficiency Diphenylpyrimidine Derivatives Blue Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes
Organic light-emitting diodes with thermally activated delayed fluorescence emitter have been developed with highly twisted donor–acceptor configurations and color-pure blue emitters. Synthesized 4-(4-(4,6-diphenylpyrimidin-2-yl)phenyl)-10H-spiro[acridine-9,9′-fluorene] (4,6-PhPMAF) doped device wit...
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doaj-2f591645249245909653fc8040e065342020-11-25T03:29:39ZengFrontiers Media S.A.Frontiers in Chemistry2296-26462020-05-01810.3389/fchem.2020.00356531414High-Efficiency Diphenylpyrimidine Derivatives Blue Thermally Activated Delayed Fluorescence Organic Light-Emitting DiodesSunyoung Sohn0Min Woo Ha1Jiyong Park2Jiyong Park3Yoo-Heon Kim4Hyungju Ahn5Sungjune Jung6Soon-Ki Kwon7Yun-Hi Kim8Department of Creative IT Engineering, Pohang University of Science and Technology, Pohang-si, South KoreaDepartment of Chemistry and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Jinju-si, South KoreaCenter for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon, South KoreaDepartment of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South KoreaDepartment of Chemistry and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Jinju-si, South KoreaPohang Accelerator Laboratory, Pohang-si, South KoreaDepartment of Creative IT Engineering, Pohang University of Science and Technology, Pohang-si, South KoreaDepartment of Materials Engineering and Convergence Technology and ERI, Gyeongsang National University, Jinju-si, South KoreaDepartment of Chemistry and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Jinju-si, South KoreaOrganic light-emitting diodes with thermally activated delayed fluorescence emitter have been developed with highly twisted donor–acceptor configurations and color-pure blue emitters. Synthesized 4-(4-(4,6-diphenylpyrimidin-2-yl)phenyl)-10H-spiro[acridine-9,9′-fluorene] (4,6-PhPMAF) doped device with spiroacridine as a donor unit and diphenylpyrimidine as acceptor exhibits the device characteristics such as the luminescence, external quantum efficiencies, current efficiencies, and power efficiencies corresponding to 213 cd/m2, 2.95%, 3.27 cd/A, and 2.94 lm/W with Commission International de l'Eclairage (CIE) coordinates of (0.15, 0.11) in 4,6-PhPMAF-doped DPEPO emitter. The reported 10-(4-(2,6-diphenylpyrimidin-4-yl)phenyl)-10H-spiro[acridine-9,9′-fluorene] (2,6-PhPMAF) doped device exhibit high device performance with 1,445 cd/m2, 12.38%, 19.6 cd/A, and 15.4 lm/W, which might be originated from increased internal quantum efficiency by up-converted triplet excitons to the singlet state with relatively smaller ΔEST of 0.17 eV and higher reverse intersystem crossing rate (kRISC) of 1.0 ×108/s in 2,6-PhPMAF than 0.27 eV and 3.9 ×107/s in 4,6-PhPMAF. Despite low performance of 4,6-PhPMAF doped device, synthesized 4,6-PhPMAF has better color purity as a deep-blue emission with y axis (0.11) than reported 2,6-PhPMAF with y axis (0.19) in CIE coordinate. The synthesized 4,6-PhPMAF has higher thermal stability of any transition up to 300°C and decomposition temperature with only 5% weight loss in 400°C than reported 2,6-PhPMAF. The maximum photoluminescence emission of 4,6-PhPMAF in various solvents appeared at 438 nm, which has blue shift about 20 nm than that of 2,6-PhPMAF, which contributes deep-blue emission in synthesized 4,6-PhPMAF.https://www.frontiersin.org/article/10.3389/fchem.2020.00356/fullorganic light-emitting diodethermally activated delayed fluorescenceblue emitterdiphenylpyrimidinesinglet–triplet energy gap |
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DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Sunyoung Sohn Min Woo Ha Jiyong Park Jiyong Park Yoo-Heon Kim Hyungju Ahn Sungjune Jung Soon-Ki Kwon Yun-Hi Kim |
spellingShingle |
Sunyoung Sohn Min Woo Ha Jiyong Park Jiyong Park Yoo-Heon Kim Hyungju Ahn Sungjune Jung Soon-Ki Kwon Yun-Hi Kim High-Efficiency Diphenylpyrimidine Derivatives Blue Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes Frontiers in Chemistry organic light-emitting diode thermally activated delayed fluorescence blue emitter diphenylpyrimidine singlet–triplet energy gap |
author_facet |
Sunyoung Sohn Min Woo Ha Jiyong Park Jiyong Park Yoo-Heon Kim Hyungju Ahn Sungjune Jung Soon-Ki Kwon Yun-Hi Kim |
author_sort |
Sunyoung Sohn |
title |
High-Efficiency Diphenylpyrimidine Derivatives Blue Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes |
title_short |
High-Efficiency Diphenylpyrimidine Derivatives Blue Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes |
title_full |
High-Efficiency Diphenylpyrimidine Derivatives Blue Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes |
title_fullStr |
High-Efficiency Diphenylpyrimidine Derivatives Blue Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes |
title_full_unstemmed |
High-Efficiency Diphenylpyrimidine Derivatives Blue Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes |
title_sort |
high-efficiency diphenylpyrimidine derivatives blue thermally activated delayed fluorescence organic light-emitting diodes |
publisher |
Frontiers Media S.A. |
series |
Frontiers in Chemistry |
issn |
2296-2646 |
publishDate |
2020-05-01 |
description |
Organic light-emitting diodes with thermally activated delayed fluorescence emitter have been developed with highly twisted donor–acceptor configurations and color-pure blue emitters. Synthesized 4-(4-(4,6-diphenylpyrimidin-2-yl)phenyl)-10H-spiro[acridine-9,9′-fluorene] (4,6-PhPMAF) doped device with spiroacridine as a donor unit and diphenylpyrimidine as acceptor exhibits the device characteristics such as the luminescence, external quantum efficiencies, current efficiencies, and power efficiencies corresponding to 213 cd/m2, 2.95%, 3.27 cd/A, and 2.94 lm/W with Commission International de l'Eclairage (CIE) coordinates of (0.15, 0.11) in 4,6-PhPMAF-doped DPEPO emitter. The reported 10-(4-(2,6-diphenylpyrimidin-4-yl)phenyl)-10H-spiro[acridine-9,9′-fluorene] (2,6-PhPMAF) doped device exhibit high device performance with 1,445 cd/m2, 12.38%, 19.6 cd/A, and 15.4 lm/W, which might be originated from increased internal quantum efficiency by up-converted triplet excitons to the singlet state with relatively smaller ΔEST of 0.17 eV and higher reverse intersystem crossing rate (kRISC) of 1.0 ×108/s in 2,6-PhPMAF than 0.27 eV and 3.9 ×107/s in 4,6-PhPMAF. Despite low performance of 4,6-PhPMAF doped device, synthesized 4,6-PhPMAF has better color purity as a deep-blue emission with y axis (0.11) than reported 2,6-PhPMAF with y axis (0.19) in CIE coordinate. The synthesized 4,6-PhPMAF has higher thermal stability of any transition up to 300°C and decomposition temperature with only 5% weight loss in 400°C than reported 2,6-PhPMAF. The maximum photoluminescence emission of 4,6-PhPMAF in various solvents appeared at 438 nm, which has blue shift about 20 nm than that of 2,6-PhPMAF, which contributes deep-blue emission in synthesized 4,6-PhPMAF. |
topic |
organic light-emitting diode thermally activated delayed fluorescence blue emitter diphenylpyrimidine singlet–triplet energy gap |
url |
https://www.frontiersin.org/article/10.3389/fchem.2020.00356/full |
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