Molecular design, synthesis, properties, and applications of organic triplet emitters exhibiting blue, green, red and white room-temperature phosphorescence

Stanitska, Mariia; Volyniuk, Dmytro; Minaev, Boris; Agren, Hans; Grazulevicius, Juozas V.

doi:10.1039/d3tc04514e

“…Owing to their long lifetime and large Stokes shift, long afterglow materials have been widely studied, 1–7 which currently rely on light sources in the ultraviolet region for excitation as reported. It is also well known that UV light is detrimental to human beings 8 and is not frequently used in people's daily lives.…”

Section: Introductionmentioning

confidence: 99%

Visible-excitable long-afterglow material with dual-mode emission of delayed fluorescence and room temperature phosphorescence

Zheng,

Li,

Zhang

2024

J. Mater. Chem. C

0

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Cocrystallization‐Induced Red Ultralong Organic Phosphorescence

Yin,

Xie,

Zhang

et al. 2024

Angewandte Chemie

0

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Organic cocrystals formed through multicomponent self‐assembly have attracted significant interest owing to their clear structure and tunable optical properties. However, most cocrystal systems suffer from inefficient long‐wavelength emission and low phosphorescence efficiency due to strong non‐radiative processes governed by the energy gap law. Herein, an efficient long‐lived red afterglow is achieved using a pyrene (Py) cocrystal system incorporating a second component (NPYC4) with thermally activated delayed fluorescence (TADF) and ultralong organic phosphorescence (UOP) properties. The cocrystal (NPYC4‐Py) not only inherits the excellent luminescence of its monomeric counterparts, but also exhibits unique dual‐mode characteristics, including persistent TADF and UOP emission with a high quantum yield of 58% and a lifetime of 362 ms. The precise cocrystal stacking distinctly reveals that intermolecular interactions lock the cocrystal formation and weaken the intermolecular π‐π interactions between NPYC4 and Py, thereby stabilizing the excited triplet excitons. Furthermore, the favorable energy level of NPYC4 acts as a bridge, reducing the energy gap between the S1 and T1 states for Py, therefore activating its red phosphorescence from Py. This research provides direct insights into achieving efficient red UOP through co‐crystallization.

show abstract

Cocrystallization‐Induced Red Ultralong Organic Phosphorescence

Yin,

Xie,

Zhang

et al. 2024

Angew Chem Int Ed

0

View full text Add to dashboard Cite

Organic cocrystals formed through multicomponent self‐assembly have attracted significant interest owing to their clear structure and tunable optical properties. However, most cocrystal systems suffer from inefficient long‐wavelength emission and low phosphorescence efficiency due to strong non‐radiative processes governed by the energy gap law. Herein, an efficient long‐lived red afterglow is achieved using a pyrene (Py) cocrystal system incorporating a second component (NPYC4) with thermally activated delayed fluorescence (TADF) and ultralong organic phosphorescence (UOP) properties. The cocrystal (NPYC4‐Py) not only inherits the excellent luminescence of its monomeric counterparts, but also exhibits unique dual‐mode characteristics, including persistent TADF and UOP emission with a high quantum yield of 58% and a lifetime of 362 ms. The precise cocrystal stacking distinctly reveals that intermolecular interactions lock the cocrystal formation and weaken the intermolecular π‐π interactions between NPYC4 and Py, thereby stabilizing the excited triplet excitons. Furthermore, the favorable energy level of NPYC4 acts as a bridge, reducing the energy gap between the S1 and T1 states for Py, therefore activating its red phosphorescence from Py. This research provides direct insights into achieving efficient red UOP through co‐crystallization.

show abstract

Molecular design, synthesis, properties, and applications of organic triplet emitters exhibiting blue, green, red and white room-temperature phosphorescence

Abstract: At room temperature, many organic compounds can emit light not only from singlet excited states but also from triplet excited states. This phenomenon is known as room temperature phosphorescence (RTP)....

Cited by 14 publications

References 107 publications

Visible-excitable long-afterglow material with dual-mode emission of delayed fluorescence and room temperature phosphorescence

Visible-excitable long-afterglow material with dual-mode emission of delayed fluorescence and room temperature phosphorescence

Cocrystallization‐Induced Red Ultralong Organic Phosphorescence

Cocrystallization‐Induced Red Ultralong Organic Phosphorescence

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