Achieving crystal-induced room temperature phosphorescence and reversible photochromic properties by strong intermolecular interactions

Xiao, Fuming; Wang, Mengzhu; Lei, Yunxiang; Dai, Wenbo; Zhou, Yun‐Bing; Liu, Miaochang; Gao, Wenxia; Huang, Xiaobo; Wu, Huayue

doi:10.1039/d0tc03980b

Cited by 32 publications

(23 citation statements)

References 40 publications

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“…Therefore, constructing organic RTP materials would benefit tissue imaging, tumor diagnosis, and drug tracking 10 – 15 . To date, most phosphorescent materials have poor biological tissue permeability because the wavelengths of their emission spectra are short (less than 580 nm) 9 , 16 – 26 . This only means phosphors provide good imaging in shallow regions of an organism.…”

Section: Introductionmentioning

confidence: 99%

Guest-host doped strategy for constructing ultralong-lifetime near-infrared organic phosphorescence materials for bioimaging

et al. 2022

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Organic near-infrared room temperature phosphorescence materials have unparalleled advantages in bioimaging due to their excellent penetrability. However, limited by the energy gap law, the near-infrared phosphorescence materials (>650 nm) are very rare, moreover, the phosphorescence lifetimes of these materials are very short. In this work, we have obtained organic room temperature phosphorescence materials with long wavelengths (600/657–681/732 nm) and long lifetimes (102–324 ms) for the first time through the guest-host doped strategy. The guest molecule has sufficient conjugation to reduce the lowest triplet energy level and the host assists the guest in exciton transfer and inhibits the non-radiative transition of guest excitons. These materials exhibit good tissue penetration in bioimaging. Thanks to the characteristic of long lifetime and long wavelength emissive phosphorescence materials, the tumor imaging in living mice with a signal to background ratio value as high as 43 is successfully realized. This work provides a practical solution for the construction of organic phosphorescence materials with both long wavelengths and long lifetimes.

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Section: Introductionmentioning

confidence: 99%

Guest-host doped strategy for constructing ultralong-lifetime near-infrared organic phosphorescence materials for bioimaging

et al. 2022

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“…[1][2][3][4][5][6][7][8][9][10] Intersystem crossing (ISC) of excitons and stable triplet excitons are the prerequisites for the organic materials to have phosphorescence emission. [11][12][13][14][15][16] The guest-host doped strategy, as an emerging technology in recent years, has great advantages in the construction of organic RTP materials, which has attracted great attention and interest. [17][18][19][20][21][22][23][24][25][26] The host matrix can not only help the energy transfer of the guest excitons, but the rigid structure of the host can effectively limit the motion of the guest molecules, thereby stabilizing the triplet excitons.…”

Section: Introductionmentioning

confidence: 99%

An Ingenious Strategy to Stereoscopically Enhance the Phosphorescence Properties of Guest-Host Materials: Adding Metal Ions to Form Coordination with the Guest

Guo

Cheng

et al. 2022

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The host-guest doped strategy has been widely recognized as an effective method to construct room temperature phosphorescence materials. However, the advantage of the host in the doped system as a container that can hold the other components is ignored. Herein, benzophenone was selected as the host and seven phenylquinoline isomers were designed as guests to construct a phosphorescence doped system. Importantly, seven metal salts of the same period or the same main family (Al3+, Cu+/2+, Zn2+, Ga3+, Ag+, Cd2+, In3+) are selected as the third component to coordinate with the nitrogen atom of the guests, thereby stereoscopically improving the phosphorescence performance of doped system. Metal ions can significantly increase the phosphorescence intensity, red-shift the emission wavelength and prolong the phosphorescence lifetime of the doped materials. Ag+ and Cd+ can greatly increase the emission intensity, up to 38 times, the highest phosphorescence quantum efficiency can reach 70%. Al3+, Ga3+, and In3+ can prolong the emission wavelength, and the phosphorescence wavelength can be red-shifted by up to 60 nm. And Cu2+, Ga3+, and In3+ can extend the phosphorescence lifetime by a maximum of 3.6 times. This is the first work to use metal ions to construct the multi-component doped system.

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“…Small ΔE ST can be achieved by designing the charge transfer of donor-acceptor system with large spatial separation between the HOMO and LUMO ( Parke and Rivard, 2018 ). To date, many single component organic molecules with twisted donor-acceptor spatial conformation have been demonstrated as efficient RTP materials ( Xiao et al, 2020 ; Xu et al, 2021 ). However, triplet state excitons of multi-component co-crystal donor-acceptor systems are still relatively limited ( Zhou and Yan, 2019 ; Zhou et al, 2020 ), and the systematical investigation is needed for well understanding the relationship between their structures and photophysical behaviors.…”

Section: Introductionmentioning

confidence: 99%

Room-Temperature Phosphorescent Co-Crystal Showing Direct White Light and Photo-Electric Conversion

et al. 2021

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The development of molecular crystalline materials with efficient room-temperature phosphorescence has been obtained much attention due to their fascinating photophysical properties and potential applications in the fields of data storage, bioimaging and photodynamic therapy. Herein, a new co-crystal complex [(DCPA) (AD)2] (DCPA = 9,10-di (4-carboxyphenyl)anthracene; AD = acridine) has been synthesized by a facile solvothermal process. Crystal structure analysis reveals that the co-crystal possesses orderly and alternant arrangement of DCPA donors and AD acceptors at molecular level. Fixed by strong hydrogen bonds, the DCPA molecule displays seriously twisty spatial conformation. Density functional theory (DFT) calculations show well separation of HOMO and LUMO for this co-crystal system, suggesting the efficient triplet excitons generation. Photoluminescence measurements show intensive cyan fluorescence (58.20 ns) and direct white phosphorescence (325 µs) emission at room-temperature. The transient current density–time curve reveals a typical switching electric response under the irradiation of simulated light, reveal that the [(DCPA) (AD)2] co-crystal has a high photoelectric response performance.

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Achieving crystal-induced room temperature phosphorescence and reversible photochromic properties by strong intermolecular interactions

Abstract: Three novel D–A-type pyranone–carbazole compounds were found to exhibit crystal-induced room temperature phosphorescence and reversible photochromic activities through strong intermolecular interactions.

Cited by 32 publications

References 40 publications

Guest-host doped strategy for constructing ultralong-lifetime near-infrared organic phosphorescence materials for bioimaging

Guest-host doped strategy for constructing ultralong-lifetime near-infrared organic phosphorescence materials for bioimaging

An Ingenious Strategy to Stereoscopically Enhance the Phosphorescence Properties of Guest-Host Materials: Adding Metal Ions to Form Coordination with the Guest

Room-Temperature Phosphorescent Co-Crystal Showing Direct White Light and Photo-Electric Conversion

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