Influence of host matrix on thermally-activated delayed fluorescence: Effects on emission lifetime,photoluminescence quantum yield,and device performance |
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| Affiliation: | 1. Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan;2. International Institute for Carbon Neutral Energy Research, Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan;1. Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan;3. International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan;4. Panasonic Corporation, 1006 Kadoma, Kadoma, Osaka 571-8501, Japan;1. Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan;2. Advanced Core Technology Laboratories, Fujifilm Corporation, 577 Ushijima, Kaisei-machi, Ashigarakami-gun, Kanagawa 258-8577, Japan;3. Innovative Organic Device Laboratory, Institute of Systems, Information Technologies and Nanotechnologies (ISIT), 744 Motooka, Nishi, Fukuoka 819-0395, Japan;4. International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan;1. Department of Nanobiomedical Science and BK21 PLUS NBM Global Research Center, Dankook University, Chungnam 330-714, Republic of Korea;2. Department of Polymer Science and Engineering, Dankook University, 126, Jukjeon-dong, Suji-gu, Yongin, Gyeonggi 448-701, Republic of Korea;3. School of Chemical Engineering, Sungkyunkwan University, Suwon, Gyeonggi 446-740, Republic of Korea |
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| Abstract: | The influence of the host molecules on the photoluminescent (PL) and electroluminescent (EL) properties of organic light-emitting diode (OLED) emitters showing efficient thermally-activated delayed fluorescence (TADF) has yet to be investigated in detail. Here we demonstrate that the choice of host can cause large variations in the PL quantum yield (ΦPL ～15–70%) and delayed PL transient decay (τdel ～2–70 ms) of a spiro-acridine-based TADF guest. We show that the effect of exciplex formation on ΦPL must be considered even at low concentrations of the TADF guest. Using the same TADF guest but changing the host layer, we are able to greatly vary the PL transient decay time from ～4 to ～70 ms while maintaining a high ΦPL ～70%, which can lead to new applications. Detailed spectral characterization during PL decay reveals a gradually increasing singlet–triplet energy gap (ΔEST) as the origin of these observations. The time-varying ΔEST is explained based on dipole interactions between the host and guest molecules. Finally, PL and electrical considerations for host selection are discussed based on the performance of OLED devices. |
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| Keywords: | Host dependence Thermally-activated delayed fluorescence Organic light-emitting diodes Exciplex Spiro compounds Oxygen sensing |
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