Metal free room temperature phosphorescence from molecular self-interactions in the solid state

Forni, Alessandra; Lucenti, Elena; Botta, Chiara; Cariati, Elena

doi:10.1039/c8tc01007b

Cited by 276 publications

(218 citation statements)

References 72 publications

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“…Room temperature phosphorescent materials have been developed rapidly during these years . Various strategies have been provided to improve the efficiency and increase the lifetime of phosphorescence at room temperature for more and more practical applications, such as OLEDs, sensing, data encryption, bioimaging and so forth.…”

Section: Rtp Materials In Biomedical Applicationsmentioning

confidence: 99%

Organic Room Temperature Phosphorescence Materials for Biomedical Applications

Zhi

Zhou

Shi

et al. 2020

Chemistry An Asian Journal

131

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Organic room temperature phosphorescence (RTP) materials have drawn increasing attention due to their unique features, especially the long emission lifetime for applications in biomedicine. In this review, we provide an overview of the recent developments of organic RTP materials applied in the biomedicine field. First, we introduce the basic mechanism of phosphorescence and subsequently we present various strategies of modulating the lifetime and efficiency of room temperature organic phosphorescence. Next, we summarize the progress of organic RTP materials in biological applications, including bioimaging, anti‐cancer and antibacterial therapies. Finally, we provide an outlook with regard to the challenges and future perspectives in the field.

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Section: Rtp Materials In Biomedical Applicationsmentioning

confidence: 99%

Organic Room Temperature Phosphorescence Materials for Biomedical Applications

Zhi

Zhou

Shi

et al. 2020

Chemistry An Asian Journal

131

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“…Recently,p ure organic luminogens with room-temperature phosphorescence (RTP) [1][2][3][4] have attracted increasing attention owing to their fundamentali mportance in deciphering the photophysical processes of singleta nd triplet excitons, [5][6][7][8][9][10] as well as their potentiala pplications in sensing, [5,[11][12][13] bioimaging, [14][15][16] anticounterfeiting, [8,[17][18][19] and so forth. In particular, those with persistent RTP (p-RTP) are also promising owing to the retaining of RTP emissione ven after ceasing the excitation sources, which means they can be used in encryption, oxygen and chemical sensing, and high-resolution molecular imaging with ideal signal-to-noise ratios.…”

Section: Introductionmentioning

confidence: 99%

Polymorphic Pure Organic Luminogens with Through‐Space Conjugation and Persistent Room‐Temperature Phosphorescence

Zhang

Zhao

et al. 2019

Chemistry An Asian Journal

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Pure organic luminogens with persistent room‐temperature phosphorescence (p‐RTP) have attracted increasing attention owing to their vital significance and potential applications in security inks, bioimaging, and photodynamic therapy. Previously reported p‐RTP luminogens normally possessed through‐bond conjugation. In this work, we report a pure organic luminogen, AN‐MA, the Diels–Alder cycloaddition adduct of anthracene (AN) and maleic anhydride (MA), which possesses isolated phenyl groups and an anhydride moiety. AN‐MA exhibits aggregation‐enhanced emission (AEE) characteristics with efficiency of approximately 2 % and up to 8.5 % in solution and crystals, respectively. Two polymorphs of AN‐MA were readily obtained that were able to generate UV emission from individual phenyl rings together with bright blue emission owing to the effective through‐space conjugation. Moreover, p‐RTP with a lifetime of up to approximately 1.6 s was obtained in the crystals. These results not only reveal a new system with both fluorescence and RTP dual emission but also suggest an alternative through‐space conjugation strategy towards pure organic p‐RTP luminogens with tunable emissions.

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“…[1, 2] Easy synthetic procedures as well as their structural tunability and air stability encourage the use of organic phosphors. In this context, we explored the room-temperature phosphorescence features of asolvent-free organic liquid phosphor in air.While alkyl chain substitution varied the physical states of the bromonaphthalimides,t he phosphorescence remained unaltered for the solvent-free liquid in air.A st he first report, as olvent-free liquid of al ong swallow-tailed bromonaphthalimide exhibits room-temperature phosphorescence in air.D oping of the phosphor with carbonyl guests resulted in enhanced phosphorescence,a nd hence al arge-area paintable phosphorescent liquid composite with improved lifetime and quantum yield was developed.…”

mentioning

confidence: 99%

“…

Organic phosphors have been widely explored with an understanding that crystalline molecular ordering is arequisite for enhanced intersystem crossing. [1][2][3][4][5][6] In recent years,o rganic small molecules decorated with various functional moieties,such as halogens, boronate esters,o rc arbonyl group, [3] have been explored in RTPm aterials.T hese structural modifications eventually resulted in efficient intersystem crossing towards stable phosphorescence.However,organic phosphors mostly exhibit excellent RTPi nt he crystalline state,r ather than in the solution state. [1, 2] Easy synthetic procedures as well as their structural tunability and air stability encourage the use of organic phosphors.

…”

mentioning

confidence: 99%

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Paintable Room‐Temperature Phosphorescent Liquid Formulations of Alkylated Bromonaphthalimide

et al. 2019

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Organic phosphors have been widely explored with an understanding that crystalline molecular ordering is arequisite for enhanced intersystem crossing. In this context, we explored the room-temperature phosphorescence features of asolvent-free organic liquid phosphor in air.While alkyl chain substitution varied the physical states of the bromonaphthalimides,t he phosphorescence remained unaltered for the solvent-free liquid in air.A st he first report, as olvent-free liquid of al ong swallow-tailed bromonaphthalimide exhibits room-temperature phosphorescence in air.D oping of the phosphor with carbonyl guests resulted in enhanced phosphorescence,a nd hence al arge-area paintable phosphorescent liquid composite with improved lifetime and quantum yield was developed.Metal-free organic materials exhibiting room-temperature phosphorescence (RTP) have found use in various applications. [1, 2] Easy synthetic procedures as well as their structural tunability and air stability encourage the use of organic phosphors. [1][2][3][4][5][6] In recent years,o rganic small molecules decorated with various functional moieties,such as halogens, boronate esters,o rc arbonyl group, [3] have been explored in RTPm aterials.T hese structural modifications eventually resulted in efficient intersystem crossing towards stable phosphorescence.However,organic phosphors mostly exhibit excellent RTPi nt he crystalline state,r ather than in the solution state. [4] Strong control over the nonradiative decay in the rigid crystalline molecular packing supports intersystem crossing. Moreover,i tr educes the triplet quenching by placing the molecules at finite distances.I ns hort, RTPi n organic phosphors is mainly controlled by intermolecular interactions and the overall organization of the molecules in the crystal. In addition, efficient triplet emission has been established with the help of several other methods,s uch as doping with molecules containing heavy atoms and matrixassisted isolation using polymers,m icelles,o rc avitands. [5,6] Theavailability of asupport medium rigidifies the emitter and in turn strengthens the radiative relaxation process.D espite all of these developments,there are still many key points to be addressed in the design of efficient organic phosphors. Moreover,t he processability of these crystalline phosphors still constitutes achallenging problem. In this context, anew processable soft material called functional molecular liquid has been introduced as ar eplacement for solid luminescent materials. [7][8][9] Here the viscous medium increases the luminescence quantum yield by suppressing the nonradiative decay. [8e] As organic phosphors have mostly been tested in the crystalline form under inert conditions,R TP liquids have never been explored.Naphthalimides are aclass of rhylene dyes that have been widely exploited in self-assembly,l ight harvesting, sensors, organic electronics,etc. [10] Here we have chosen two alkylated 4-bromo-1,8-naphthlimidesshowing RTPinboth the crystalline and liquid state for their narrow si...

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Metal free room temperature phosphorescence from molecular self-interactions in the solid state

Abstract: Purely organic materials showing solid state room temperature phosphorescence (RTP) are receiving an ever growing interest due to their low toxicity, cost and environmental load compared to their organometallic counterparts.

Cited by 276 publications

References 72 publications

Organic Room Temperature Phosphorescence Materials for Biomedical Applications

Organic Room Temperature Phosphorescence Materials for Biomedical Applications

Polymorphic Pure Organic Luminogens with Through‐Space Conjugation and Persistent Room‐Temperature Phosphorescence

Paintable Room‐Temperature Phosphorescent Liquid Formulations of Alkylated Bromonaphthalimide

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