Duale Emission: Klassen, Mechanismen und Bedingungen

Behera, Santosh Kumar; Park, Soo Young; Gierschner, Johannes

doi:10.1002/ange.202009789

Angewandte Chemie

2021

DOI: 10.1002/ange.202009789

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Duale Emission: Klassen, Mechanismen und Bedingungen

Santosh Kumar Behera

Soo Young Park

Johannes Gierschner

Abstract: zu finden.Dual emittierende (DE-)Verbindungen finden starkes Interesse in den Material-and Biowissenschaften;allerdings fehlt eine systematische Zusammenfassung der zugrundeliegenden Prozesse.Diese erfolgt hier durch eine Klassifizierung der DE-Phänomene,w obei zwischen Prozessen unterschieden wird, die einerseits auf nur einem Emitter mit zwei emittierenden Zuständen oder andererseits auf zwei unbhängigen Emittern oder zwei korrelierten Emittern beruhen. Danach werden die fürdie Materialwissenschaften relevan… Show more

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Cited by 10 publications

References 226 publications

(260 reference statements)

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Pure Boric Acid Does Not Show Room‐Temperature Phosphorescence (RTP)

Roldao

Rauch

et al. 2022

Angewandte Chemie

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Boric acid (BA) has been used as a transparent glass matrix for optical materials for over 100 years. However, recently, apparent room‐temperature phosphorescence (RTP) from BA (crystalline and powder states) was reported (Zheng et al., Angew. Chem. Int. Ed. 2021, 60, 9500) when irradiated at 280 nm under ambient conditions. We suspected that RTP from their BA sample was induced by an unidentified impurity. Our experimental results show that pure BA synthesized from B(OMe)3 does not luminesce in the solid state when irradiated at 250–400 nm, while commercial BA indeed (faintly) luminesces. Our theoretical calculations show that neither individual BA molecules nor aggregates would absorb light at >175 nm, and we observe no absorption of solid pure BA experimentally at >200 nm. Therefore, it is not possible for pure BA to be excited at >250 nm even in the solid state. Thus, pure BA does not display RTP, whereas trace impurities can induce RTP.

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Pure Boric Acid Does Not Show Room‐Temperature Phosphorescence (RTP)

Roldao

Rauch

et al. 2022

Angewandte Chemie

Self Cite

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Single‐Fluorophore‐Based Organic Crystals with Distinct Conformers Enabling Wide‐Range Excitation‐Dependent Emissions

et al. 2022

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Achieving wide-range tunable emission colors, especially in the solid state of single-fluorophore materials, remains a significant challenge. Herein, we report a molecular design strategy that affords wide-range excitation-dependent emissions spanning over � 230 nm in crystalline states. Under the donor-π-acceptor configuration, we judiciously choose a rotatable acceptor fragment, o-carborane, to enrich conformational diversities in the crystalline state and generate conformationdependent multicolor emissions. We further show that this molecular platform is generalizable in creating crystalline materials with multicolor emissions. Based on these materials, a high-capacity information storage device and a finite-state machine were fabricated to showcase multicolor displays and information storage.

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Excitation‐Dependent Multicolour Luminescence of Organic Materials: Internal Mechanism and Potential Applications

Shen

Liu

et al. 2022

Angewandte Chemie

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Excitation-dependent emission (Ex-de) materials have been of considerable academic interest and have potential applications in real life. Such multicolour luminescence is a characteristic exception to the ubiquitously accepted Kasha's rule. This phenomenon has been increasingly presented in some studies on different luminescence systems; however, a systematic overview of the mechanisms underlying this phenomenon is currently absent. Herein, we resolve this issue by classifying multicolour luminescence from single chromophores and dual/ternary chromophores, as well as multiple emitting species. The underlying processes are described based on electronic and/or geometrical conditions under which the phenomenon occurs. Before we present it in categories, related photophysical and photochemical foundations are introduced. This systematic overview will provide a clear approach to designing multicolour luminescence materials for special applications.

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Duale Emission: Klassen, Mechanismen und Bedingungen

Cited by 10 publications

References 226 publications

Pure Boric Acid Does Not Show Room‐Temperature Phosphorescence (RTP)

Pure Boric Acid Does Not Show Room‐Temperature Phosphorescence (RTP)

Single‐Fluorophore‐Based Organic Crystals with Distinct Conformers Enabling Wide‐Range Excitation‐Dependent Emissions

Excitation‐Dependent Multicolour Luminescence of Organic Materials: Internal Mechanism and Potential Applications

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