9,9‐Dimethylxanthene Derivatives with Room‐Temperature Phosphorescence: Substituent Effects and Emissive Properties

Liao, Qiuyan; Gao, Qihe; Wang, Jiaqiang; Gong, Yanbing; Peng, Qian; Tian, Yu; Yang, Fan; Guo, Haojie; Ding, Dan; Li, Qianqian; Li, Zhen

doi:10.1002/ange.201916057

Cited by 87 publications

(18 citation statements)

References 57 publications

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“…Crystallization/H-aggregation 11 , 12 and exciplex formation 13 – 15 strategies previously proposed to construct OURTP are difficult to realize the blue organic afterglow owing to the unavoidable red-shift compared to the single-molecular fluorescence after the aggregation coupling and intermolecular electronic interaction in solid states 16 . Dispersing emitters in host is effective in preventing the bathochromic shift and eliminating the concentration quenching by inhibiting molecular aggregation and electronic coupling at low doping concentrations 17 .…”

Section: Introductionmentioning

confidence: 99%

Design of highly efficient deep-blue organic afterglow through guest sensitization and matrices rigidification

et al. 2020

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Blue/deep-blue emission is crucial for organic optoelectronics but remains a formidable challenge in organic afterglow due to the difficulties in populating and stabilizing the high-energy triplet excited states. Here, a facile strategy to realize the efficient deep-blue organic afterglow is proposed via host molecules to sensitize the triplet exciton population of guest and water implement to suppress the non-radiative decays by matrices rigidification. A series of highly luminescent deep-blue (405–428 nm) organic afterglow materials with lifetimes up to 1.67 s and quantum yields of 46.1% are developed. With these high-performance water-responsive materials, lifetime-encrypted rewritable paper has been constructed for water-jet printing of high-resolution anti-counterfeiting patterns that can retain for a long time (>1 month) and be erased by dimethyl sulfoxide vapor in 15 min with high reversibility for many write/erase cycles. These results provide a foundation for the design of high-efficient blue/deep-blue organic afterglow and stimuli-responsive materials with remarkable applications.

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Section: Introductionmentioning

confidence: 99%

Design of highly efficient deep-blue organic afterglow through guest sensitization and matrices rigidification

et al. 2020

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“…Recently, a series of important advances have been made in pure organic RTP materials, [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] which provide a great opportunity and a solid foundation to develop pure organic SMWLE materials through a combined mechanism of fluorescence and RTP. However, pure organic phosphorescence is commonly observed under rigorous conditions (e.g., cryogenic or vacuum) as a result of spin-forbidden transition of T 1 →S 0 , leading to very rare dual-emission real systems of fluorescence and RTP under ambient conditions.…”

Section: Introductionmentioning

confidence: 99%

Modulating Room Temperature Phosphorescence by Oxidation of Thianthrene to Achieve Pure Organic Single-Molecule White-Light Emission

et al. 2021

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In order to develop pure organic single-molecule white-light emitters (SMWLE), the oxidation of thianthrene (TA) was performed on sulfur atoms at different degrees to tune room temperature phosphorescence (RTP) emission. With increasing degrees of oxidation from 1OTA, 2OTA, 3OTA, to 4OTA, monomeric and aggregative RTP emission was gradually suppressed, due to the gradual disappearance of lone pair electrons on sulfur atoms. Among these compounds, monomers and aggregates of 1OTA demonstrated a better intensity match between fluorescence and RTP. Through partial oxidation of TA, 1OTA exhibited the simultaneous ternary emissions from the lowest singlet state (S 1 ), the lowest triplet state (T 1 ), and the high-lying triplet state (T n ) in doped film. The single-molecule white-light emission was achieved in 1OTA crystal with a photoluminescence quantum yield (PLQY) of 47.1%. This work not only reports the RTP behavior of TA with different degrees of oxidation, but also provides an example of excited-state modulation to harvest an efficient SMWLE material.

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“…Photoluminescent materials, including fluorescent and phosphorescent materials, have become a research spotlight since their discovery (1)(2)(3)(4)(5). Compared with fluorescent materials, materials with room-temperature phosphorescence (RTP) have received special attention for their larger Stokes shift and longer lifetime (6)(7)(8)(9)(10)(11)(12)(13). These advantages promote their applications in the fields such as molecular switches (14)(15)(16)(17)(18), organic light-emitting diodes (OLEDs) (19)(20)(21)(22)(23), anticounterfeiting (24) and bioimaging (25).…”

Section: Main Textmentioning

confidence: 99%

Activating Room-Temperature Phosphorescence of Organic Luminophores via External Heavy-Atom Effect and Rigidity of Ionic Polymer Matrix

Ma¹,

Yan²,

Lin³

et al. 2021

Preprint

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Pure organic room-temperature phosphorescence (RTP) materials have attracted wide attention for their easy preparation, low toxicity and applications in professional fields such as bioimaging and anti-counterfeiting. Developing phosphorescent systems with more universality and less difficulty in synthesis has long been the pursuit of materials scientists. By employing polymeric quaternary ammonium salt with an ionic bonding matrix and heavy atoms, commercial fluorescent dyes are directly endowed with phosphorescence emission. In a single amorphous polymer, the external heavy-atom effect generates excited triplet states, which are further stabilized by the rigid polymer matrix. This study proposed a new general strategy to design and develop pure organic RTP materials starting from the vast library of organic dyes without complicated chemical synthesis.

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9,9‐Dimethylxanthene Derivatives with Room‐Temperature Phosphorescence: Substituent Effects and Emissive Properties

Cited by 87 publications

References 57 publications

Design of highly efficient deep-blue organic afterglow through guest sensitization and matrices rigidification

Design of highly efficient deep-blue organic afterglow through guest sensitization and matrices rigidification

Modulating Room Temperature Phosphorescence by Oxidation of Thianthrene to Achieve Pure Organic Single-Molecule White-Light Emission

Activating Room-Temperature Phosphorescence of Organic Luminophores via External Heavy-Atom Effect and Rigidity of Ionic Polymer Matrix

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