Efficient and organic host–guest room-temperature phosphorescence: tunable triplet–singlet crossing and theoretical calculations for molecular packing

Lei, Yunxiang; Yang, Jiaxin; Dai, Wenbo; Lan, Yisha; Yang, Jianhui; Zheng, Xiaoyan; Shi, Jianbing; Tong, Bin; Cai, Zhengxu; Dong, Yuping

doi:10.1039/d1sc01175h

Cited by 107 publications

(108 citation statements)

References 47 publications

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“…S4), which is in line with our previous works. [40][41][42][43] Four other guest-host materials (MOPy/BPO, MAPy/BPO, DMOPy /BPO, and DMAPy/BPO, Fig. 1a) with the guest-host molar ratio of 1:1000 were further prepared, and the luminescence characteristics of the host-guest systems were systematically investigated.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, we simulated the molecular conformations of Py molecules in the BPO matrix using MD simulations. 41 The Starting from the initial Py/BPO configuration, we perform further 10 ns production MD simulations to relax the whole guest-host system using GROMACS software package (version 5.1.5, details in SI). Compared with the conformations of BPO molecules in single crystal, the corresponding conformations of the BPO molecules adjacent to the guest Py molecule in Py/BPO guest-host system is slightly different because the twisted angles increases slightly after doping (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…In our previous works, we found that the host could assist the excitons of the guests in energy transfer. [41][42][43] So in this work, we first tested the excitation spectra (fluorescence emission/420 nm) of guest MAPy in common solvents (toluene, THF, and N,N-dimethylformamide/DMF) and host BPO (molten state and crystal state). As show in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, guest-host materials have gradually attracted more attention, [34][35][36][37][38][39][40][41][42][43][44][45][46][47] because the host matrix can inhibit the non-radiative transition of the guest excitons in the guest-host system. [42][43][44][45][46][47] Additionally, some research results have shown that there is energy synergy between the host and guest molecules, which can effectively assist the guest molecules to transfer the excited state energy.…”

Section: Introductionmentioning

confidence: 99%

“…[42][43][44][45][46][47] Additionally, some research results have shown that there is energy synergy between the host and guest molecules, which can effectively assist the guest molecules to transfer the excited state energy. [39][40][41][42][43] Therefore, the guest-host system provides a new strategy for the construction of organic RTP materials with long wavelength and long lifetime.…”

Section: Introductionmentioning

confidence: 99%

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Constructing Ultralong Near-infrared Organic Phosphorescence Materials with 732 nm through One-axis Two-wing Guest-Host Strategy for Bioimaging

Xiao

Hong

Lei

et al. 2021

Preprint

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Organic near-infrared room temperature phosphorescence (RTP) materials have unparalleled advantages in bioimaging due to their better penetrability. However, limited by the energy gap law, organic matters with long wavelengths (> 700 nm) and long lifetimes (> 100 ms) have not been reported so far. In this work, we have obtained organic RTP materials with long wavelengths (657-732 nm) and long lifetimes (102-324 ms) for the first time through the one-axis two-wing guest-host strategy. The one axis refers to that the guest molecule has sufficient conjugation to reduce the lowest triplet energy level and the two wings refer to that 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 RTP 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 RTP materials with both long wavelengths and long lifetimes used in bioimaging.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Constructing Ultralong Near-infrared Organic Phosphorescence Materials with 732 nm through One-axis Two-wing Guest-Host Strategy for Bioimaging

Xiao

Hong

Lei

et al. 2021

Preprint

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Achieving Efficient Phosphorescence and Mechanoluminescence in Organic Host–Guest System by Energy Transfer

Yang

Shi

et al. 2021

Adv Funct Materials

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Host-guest doping strategy greatly facilitates and expands the scope of construction of organic phosphorescence materials. Herein, triphenylamine with excellent crystallinity is chosen as the host, and four guests with 2-4 triphenylamine repeating units are chosen as the guests. The similarity in molecular structures of the host and guests simplifies the exploration of the luminescence mechanism in the doped system. The doped materials display strong room temperature phosphorescence (RTP) with above 200 ms lifetimes and 30% quantum yields. In addition, the doped system emits blue fluorescence under mechanical stimulation, that is, shows a phenomenon of mechanoluminescence (ML). The experimental results prove that the host plays different roles in different luminescence processes. In the photophosphorescence process, the triplet energy level of the host assists the guest excitons to undergo intersystem crossing. Meanwhile, in the ML process, the energy generated as a result of piezoelectric property of the host crystal is transferred to the guest, causing the guest molecules to emit fluorescence. This work is significant for the construction of doped materials with multiple luminescence properties, including RTP and ML.

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Controllable Modulation of Efficient Phosphorescence Through Dynamic Metal‐Ligand Coordination for Reversible Anti‐Counterfeiting Printing of Thermal Development

Dai

Zhang

et al. 2022

Adv Funct Materials

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Dynamically tunable room-temperature phosphorescence (RTP) organic materials have attracted considerable attention in recent years due to their great potential over a wide variety of advanced applications. However, the precise regulation of the intersystem crossing (ISC) process for efficient RTP materials with dynamically modulated properties in a rigid environment is challenging. Herein, an effective strategy for RTP material preparation with controllably regulated properties is developed via the construction of dynamic metal-ligand coordination in a host-guest doped system. The coordination interaction promotes ISC and phosphorescence emission of the guest, thus allowing the modulation of the photophysical properties of doped materials by changing the doping ratio and Zn 2+ counterions. By taking advantage of the reversible metal-ligand coordination interaction, the coordination-activated, and dissociation-deactivated RTP is dynamically manipulated. With the unique Zn 2+ -responsible RTP enhancement materials, the anti-counterfeiting applications of thermal development, and color inversion have been constructed for inkjet printing of high-resolution patterns with high reversibility for many write/erase cycles. The results show that dynamic metal-ligand coordination strategy is a promising approach for achieving efficient RTP materials with controllably modulated properties.

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Efficient and organic host–guest room-temperature phosphorescence: tunable triplet–singlet crossing and theoretical calculations for molecular packing

Abstract: Organic host-guest doping materials with room temperature phosphorescence (RTP) phenomenon have attracted considerable attention. However, it was still challenging to investigate their corresponding luminescence mechanism, because host-guest system very difficult...

Cited by 107 publications

References 47 publications

Constructing Ultralong Near-infrared Organic Phosphorescence Materials with 732 nm through One-axis Two-wing Guest-Host Strategy for Bioimaging

Constructing Ultralong Near-infrared Organic Phosphorescence Materials with 732 nm through One-axis Two-wing Guest-Host Strategy for Bioimaging

Achieving Efficient Phosphorescence and Mechanoluminescence in Organic Host–Guest System by Energy Transfer

Controllable Modulation of Efficient Phosphorescence Through Dynamic Metal‐Ligand Coordination for Reversible Anti‐Counterfeiting Printing of Thermal Development

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