Isotope Effect of Host Material on Device Stability of Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes

Xuelong Liu; Chin-Yiu Chan; Fabrice Mathevet; Masashi Mamada; Youichi Tsuchiya; Yi-Ting Lee; Hajime Nakanotani; Shinichiro Kobayashi; Masayuki Shiochi; Chihaya Adachi

doi:10.1002/smsc.202000057

Isotope Effect of Host Material on Device Stability of Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes

Xuelong Liu, Chin-Yiu Chan^*, Fabrice Mathevet, Masashi Mamada, Youichi Tsuchiya, Yi-Ting Lee, Hajime Nakanotani, Shinichiro Kobayashi, Masayuki Shiochi, Chihaya Adachi^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

49 Citations (Scopus)

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Abstract

Organic light-emitting diodes (OLEDs) exhibiting thermally activated delayed fluorescence (TADF) have attracted great interest because of their excellent exciton harvesting ability in electroluminescence (EL). While TADF-OLEDs show a high EL efficiency, the device operational stability is not necessarily satisfactory for commercial applications. Herein, the isotope effect of the host material on the device operational stability in TADF-OLEDs is investigated. It is unveiled that the deuterated host, i.e., PYD2Cz-d₁₆, forms a denser film than that of the nondeuterated host, PYD2Cz, demonstrating enhanced stable amorphous nature and balanced carrier transport properties. In green TADF-OLEDs, the PYD2Cz-d₁₆-based OLED considerably lengthens the device operational stability of LT₉₅ (95% of the initial luminance) to ≈140 h at an initial luminance of 1000 cd m⁻², which is 1.7 times longer than that of PYD2Cz. Device stabilities of blue TADF-OLEDs with PYD2Cz-d₁₆ as a host are also demonstrated with an enhancement of 2 times in LT₅₀ at an initial luminance of 1000 cd m⁻². It is suggested that the deuterated materials have a positive effect on the device stability in not only TADF-OLEDs, but also all other OLEDs having fluorescence and phosphorescence emitters. © 2021 The Authors. Small Science published by Wiley-VCH GmbH.

Original language	English
Article number	2000057
Journal	Small Science
Volume	1
Issue number	4
Online published	7 Feb 2021
DOIs	https://doi.org/10.1002/smsc.202000057
Publication status	Published - Apr 2021
Externally published	Yes

Research Keywords

deuteration of organic functional materials
isotope effects
operational stability
organic light-emitting diodes
thermally activated delayed fluorescence

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This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0/

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@article{5bae8b8a2f884c369da367b241b6dfbf,

title = "Isotope Effect of Host Material on Device Stability of Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes",

abstract = "Organic light-emitting diodes (OLEDs) exhibiting thermally activated delayed fluorescence (TADF) have attracted great interest because of their excellent exciton harvesting ability in electroluminescence (EL). While TADF-OLEDs show a high EL efficiency, the device operational stability is not necessarily satisfactory for commercial applications. Herein, the isotope effect of the host material on the device operational stability in TADF-OLEDs is investigated. It is unveiled that the deuterated host, i.e., PYD2Cz-d16, forms a denser film than that of the nondeuterated host, PYD2Cz, demonstrating enhanced stable amorphous nature and balanced carrier transport properties. In green TADF-OLEDs, the PYD2Cz-d16-based OLED considerably lengthens the device operational stability of LT95 (95% of the initial luminance) to ≈140 h at an initial luminance of 1000 cd m−2, which is 1.7 times longer than that of PYD2Cz. Device stabilities of blue TADF-OLEDs with PYD2Cz-d16 as a host are also demonstrated with an enhancement of 2 times in LT50 at an initial luminance of 1000 cd m−2. It is suggested that the deuterated materials have a positive effect on the device stability in not only TADF-OLEDs, but also all other OLEDs having fluorescence and phosphorescence emitters. {\textcopyright} 2021 The Authors. Small Science published by Wiley-VCH GmbH.",

keywords = "deuteration of organic functional materials, isotope effects, operational stability, organic light-emitting diodes, thermally activated delayed fluorescence",

author = "Xuelong Liu and Chin-Yiu Chan and Fabrice Mathevet and Masashi Mamada and Youichi Tsuchiya and Yi-Ting Lee and Hajime Nakanotani and Shinichiro Kobayashi and Masayuki Shiochi and Chihaya Adachi",

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doi = "10.1002/smsc.202000057",

language = "English",

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TY - JOUR

T1 - Isotope Effect of Host Material on Device Stability of Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes

AU - Liu, Xuelong

AU - Chan, Chin-Yiu

AU - Mathevet, Fabrice

AU - Mamada, Masashi

AU - Tsuchiya, Youichi

AU - Lee, Yi-Ting

AU - Nakanotani, Hajime

AU - Kobayashi, Shinichiro

AU - Shiochi, Masayuki

AU - Adachi, Chihaya

PY - 2021/4

Y1 - 2021/4

N2 - Organic light-emitting diodes (OLEDs) exhibiting thermally activated delayed fluorescence (TADF) have attracted great interest because of their excellent exciton harvesting ability in electroluminescence (EL). While TADF-OLEDs show a high EL efficiency, the device operational stability is not necessarily satisfactory for commercial applications. Herein, the isotope effect of the host material on the device operational stability in TADF-OLEDs is investigated. It is unveiled that the deuterated host, i.e., PYD2Cz-d16, forms a denser film than that of the nondeuterated host, PYD2Cz, demonstrating enhanced stable amorphous nature and balanced carrier transport properties. In green TADF-OLEDs, the PYD2Cz-d16-based OLED considerably lengthens the device operational stability of LT95 (95% of the initial luminance) to ≈140 h at an initial luminance of 1000 cd m−2, which is 1.7 times longer than that of PYD2Cz. Device stabilities of blue TADF-OLEDs with PYD2Cz-d16 as a host are also demonstrated with an enhancement of 2 times in LT50 at an initial luminance of 1000 cd m−2. It is suggested that the deuterated materials have a positive effect on the device stability in not only TADF-OLEDs, but also all other OLEDs having fluorescence and phosphorescence emitters. © 2021 The Authors. Small Science published by Wiley-VCH GmbH.

AB - Organic light-emitting diodes (OLEDs) exhibiting thermally activated delayed fluorescence (TADF) have attracted great interest because of their excellent exciton harvesting ability in electroluminescence (EL). While TADF-OLEDs show a high EL efficiency, the device operational stability is not necessarily satisfactory for commercial applications. Herein, the isotope effect of the host material on the device operational stability in TADF-OLEDs is investigated. It is unveiled that the deuterated host, i.e., PYD2Cz-d16, forms a denser film than that of the nondeuterated host, PYD2Cz, demonstrating enhanced stable amorphous nature and balanced carrier transport properties. In green TADF-OLEDs, the PYD2Cz-d16-based OLED considerably lengthens the device operational stability of LT95 (95% of the initial luminance) to ≈140 h at an initial luminance of 1000 cd m−2, which is 1.7 times longer than that of PYD2Cz. Device stabilities of blue TADF-OLEDs with PYD2Cz-d16 as a host are also demonstrated with an enhancement of 2 times in LT50 at an initial luminance of 1000 cd m−2. It is suggested that the deuterated materials have a positive effect on the device stability in not only TADF-OLEDs, but also all other OLEDs having fluorescence and phosphorescence emitters. © 2021 The Authors. Small Science published by Wiley-VCH GmbH.

KW - deuteration of organic functional materials

KW - isotope effects

KW - operational stability

KW - organic light-emitting diodes

KW - thermally activated delayed fluorescence

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U2 - 10.1002/smsc.202000057

DO - 10.1002/smsc.202000057

M3 - RGC 21 - Publication in refereed journal

SN - 2688-4046

VL - 1

JO - Small Science

JF - Small Science

IS - 4

M1 - 2000057

ER -

Isotope Effect of Host Material on Device Stability of Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes

Abstract

Research Keywords

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