An Electroactive Pure Organic Room‐Temperature Phosphorescence Polymer Based on a Donor‐Oxygen‐Acceptor Geometry

Liu, Xinrui; Yang, Liuqing; Li, Xuefei; Zhao, Lei; Wang, Shumeng; Lu, Zheng‐Hong; Ding, Junqiao; Wang, Lixiang

doi:10.1002/ange.202011957

Cited by 11 publications

(2 citation statements)

References 46 publications

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“…In all, the observed electroactivity is beneficial for charge transport in PLEDs, which will be discussed below. 38 2.3. Photophysical Properties.…”

Section: Resultsmentioning

confidence: 99%

Color Tuning in Thermally Activated Delayed Fluorescence Polymers with Carbazole and Tetramethylphenylene Backbone

et al. 2023

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Based on a carbazole and tetramethylphenylene backbone, a new class of thermally activated delayed fluorescence (TADF) polymers has been designed and synthesized using 3,6diphenylacridine as the donor and diphenylsulfone, benzophenone, or N-phenylnaphthalimide as the acceptor. Benefitting from the enhanced electron-withdrawing capability of the acceptor, the charge transfer (CT) in the side chain is found to be strengthened gradually, thus leading to a significant bathochromic shift for the photoluminescence from 486 to 624 nm. In addition, the singlet− triplet energy splitting (ΔE ST ) is measured to be as low as 68−165 meV for all of the polymers, which enables them to realize the efficient delayed fluorescence with the delayed lifetimes of 1.4− 27.4 μs. The corresponding PLEDs are fabricated via a solution processing, revealing sky-blue, green, and red electroluminescence with the peak external quantum efficiencies of 12.5, 16.5, and 3.6% as well as Commission Internationale de l'Eclairage coordinates of (0.22, 0.43), (0.37, 0.57), and (0.62, 0.38), respectively. The results clearly highlight the color tuning in TADF polymers with a carbazole and tetramethylphenylene backbone.

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“…In all, the observed electroactivity is beneficial for charge transport in PLEDs, which will be discussed below. 38 2.3. Photophysical Properties.…”

Section: Resultsmentioning

confidence: 99%

Color Tuning in Thermally Activated Delayed Fluorescence Polymers with Carbazole and Tetramethylphenylene Backbone

et al. 2023

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“…Organic room temperature phosphorescence (RTP) systems with long lifetime afterglow have been deeply investigated and widely applied in various areas, including organic optoelectronics, chemical biomedicine, optical sensing, and information encryption [1][2][3] . Excellent phosphorescence have been realized using various strategies through boosting intersystem crossing (ISC) from excited singlet state (S 1 ) to triplet states (T n ) and meanwhile inhibiting nonradiative decays, including heavy atom effect [4][5][6] , El-Sayed's rule 7,8 , crystallization engineering [9][10][11][12][13] , recombination of charge-separated states [14][15][16][17] , energy transfer (ET) 18,19 , hydrogen-bonding interaction [20][21][22][23] , through-space conjugation [24][25][26] , polymer matrix assistance [27][28][29][30][31][32][33] , resonance activation 34,35 , multicomponent combination [36][37][38][39][40][41][42] , and etc. The emission behaviors of organic RTP materials are sensitive to temperature, oxygen, light or humidity, so that they can be regulated by external stimuli, and have versatile potential applications.…”

Section: Introductionmentioning

confidence: 99%

Anti-Kasha Triplet Energy Transfer: Excitation Wavelength Dependent Persistent Luminescence from Host-Guest Doping Systems

Xie

Huang

et al. 2023

Preprint

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Anti-Kasha’s emission in organic luminogens has attracted many attentions since its discovery. However, only limited examples of anti-Kasha rule have been reported and anti-Kasha triplet energy transfer (ET) is even less-touched. This work provided an efficient strategy to realize excitation wavelength dependent (Ex-De) afterglow in a host-guest system benefiting from anti-Kasha rule. Host has almost imperceptible RTP upon 365 nm excitation and guest is totally RTP inactive, while the doping system exhibits Ex-De afterglow with improved quantum yields. Anti-Kasha triplet ET process is demonstrated from the higher excited triplet state T2 of host to the lowest excited singlet state S1 of the aggregated/unimolecular state of guest. ET efficiency in the doping system could be tuned by adopting denser or looser intermolecular packing through simply changing processing methods. The strategy of anti-Kasha triplet ET endows doping system with multiple stimuli-responsive properties, including Ex-De afterglow, mechano- and thermal-triggered afterglow behavior. Corresponding applications are also realized in multiple information anti-counterfeiting and display.

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Tunable Second‐Level Room‐Temperature Phosphorescence of Solid Supramolecules between Acrylamide–Phenylpyridium Copolymers and Cucurbit[7]uril

Liu

Chen

et al. 2021

Angewandte Chemie

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A series of solid supramolecules based on acrylamide-phenylpyridium copolymers with various substituent groups (PÀ R: R =À CN, À CO 2 Et, À Me, À CF 3 ) and cucurbit [7]uril (CB[7]) are constructed to exhibit tunable second-level (from 0.9 s to 2.2 s) room-temperature phosphorescence (RTP) in the amorphous state. Compared with other solid supramolecules PÀ R/CB [7] (R =À CN, À CO 2 Et, À Me), PÀ CF 3 /CB [7] displays the longest lifetime (2.2 s), which is probably attributed to the fluorophilic interaction of cucurbiturils leading to a uncommon host-guest interaction between 4-phenylpyridium with À CF 3 and CB [7]. Furthermore, the RTP solid supramolecular assembly (donors) can further react with organic dyes Eosin Y or SR101 (acceptors) to form ternary supramolecular systems featuring ultralong phosphorescence energy transfer (PpET) and visible delayed fluorescence (yellow for EY at 568 nm and red for SR101 at 620 nm). Significantly, the ultralong multicolor PpET supramolecular assembly can be further applied in fields of anti-counterfeiting and information encryption and painting.

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An Electroactive Pure Organic Room‐Temperature Phosphorescence Polymer Based on a Donor‐Oxygen‐Acceptor Geometry

Cited by 11 publications

References 46 publications

Color Tuning in Thermally Activated Delayed Fluorescence Polymers with Carbazole and Tetramethylphenylene Backbone

Color Tuning in Thermally Activated Delayed Fluorescence Polymers with Carbazole and Tetramethylphenylene Backbone

Anti-Kasha Triplet Energy Transfer: Excitation Wavelength Dependent Persistent Luminescence from Host-Guest Doping Systems

Tunable Second‐Level Room‐Temperature Phosphorescence of Solid Supramolecules between Acrylamide–Phenylpyridium Copolymers and Cucurbit[7]uril

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