Abstract
Recently, there has been remarkable progress of the host-guest doped pure organic room-temperature phosphorescence (RTP) materials. However, it remains a great challenge to develop highly efficient host-guest doping systems. In this study, we have successfully developed a heavy atom free pure organic molecular doped system (benzophenone-thianthrene, respectively) with efficient RTP through a simple host-guest doping strategy. Furthermore, by optimizing the doping ratios, the host-guest material with a molar ratio of 100:1 presented an efficient RTP emission with 46% quantum efficiency and a long lifetime of up to 9.17 ms under ambient conditions. This work will provide an effective way to design new organic doping systems with RTP.
Highlights
Purely organic room temperature phosphorescence (RTP) materials are gaining more and more attention because of their long luminescent lifetimes, larger Stokes shift, convenient syntheses, low cost, and so on (Ma et al, 2019; Xiong et al, 2019), showing potential applications in display (Wang et al, 2019), data storage (Xu et al, 2016), encryption (Hirata, 2017), and bioimaging (Qu et al, 2019), and so on
Lei et al (2019) have developed a series of heavy-atom-free pure organic host-guest doping systems by using 4-(2-(4-(diphenylamino) -phenyl)-2-oxoethyl) benzonitrile with a donor moiety and an acceptor moiety within the same molecule as a guest, and TPA and 4-(cyanomethyl) benzonitrile as a donor host and acceptor host respectively, which lead to an enhanced fluorescence (Φ 63~76%) and room-temperature phosphorescence (RTP) (Φ 7.6~14.5%, τ 119~317 ms) under ambient conditions
The powder X-ray diffraction (XRD) patterns (Figure 1B) reveal that there are no significant changes in the spectra of BPO from 1000:1 to 5:1 molar ratio of BPO/TTR
Summary
Purely organic room temperature phosphorescence (RTP) materials are gaining more and more attention because of their long luminescent lifetimes, larger Stokes shift, convenient syntheses, low cost, and so on (Ma et al, 2019; Xiong et al, 2019), showing potential applications in display (Wang et al, 2019), data storage (Xu et al, 2016), encryption (Hirata, 2017), and bioimaging (Qu et al, 2019), and so on. Lei et al (2019) have developed a series of heavy-atom-free pure organic host-guest doping systems by using 4-(2-(4-(diphenylamino) -phenyl)-2-oxoethyl) benzonitrile with a donor moiety (triphenylamine, TPA) and an acceptor moiety (benzonitrile) within the same molecule as a guest, and TPA and 4-(cyanomethyl) benzonitrile as a donor host and acceptor host respectively, which lead to an enhanced fluorescence (Φ 63~76%) and RTP (Φ 7.6~14.5%, τ 119~317 ms) under ambient conditions. This work will provide an effective way to further design new organic doping systems with RTP
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