Bottom‐Up Selective Growth of Ultralong Organic Phosphorescence Nanocrystals with Optimized Crystal Forms for In Vivo Optical Imaging

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 24, 2025

Ultralong organic phosphorescence (UOP) materials are valuable for biological imaging to avoid interference from fluorescence background signals because of their delayed emission property. Obtaining nanocrystals with high quantum yield is a critical factor achieve high-quality UOP imaging. Herein, pair host-guest doped system variable crystal forms the host constructed. By exploring relationship between form and system, importance revealed in systems. Furthermore, overcome low crystallinity numerous defects faced by traditional bottom-up strategies nanocrystal preparation, strategy proposed selective preparation target form. Through controlling evaporation rate solvent, ordered growth crystals can be effectively regulated obtain different bioimaging applications.

Language: Английский

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Pure Organic Thermally Activated Delayed Fluorescence Afterglow Polymers via Dopant Isomerization

ACS Macro Letters, Journal Year: 2025, Volume and Issue: unknown, P. 265 - 271

Published: Feb. 13, 2025

N-(o-Cyanophenyl)carbazole can be dimerized at different positions, which may change excited state behaviors. Herein, 2,3′-dicyano-3,4′-di(carbazol-9-yl)biphenyl (D34C) is designed and synthesized doped into polymers. However, we find that D34C does not exhibit room temperature phosphorescence but emits fluorescence (FL) bright thermally activated delayed (TADF) with lifetimes of hundreds milliseconds, observed in diverse matrices such as PMMA, MBS, ABS, PS, HIPS, SIS. The simple positional isomerization makes the abundant triplet excitons undergo only reverse intersystem crossing rather than (RTP) radiation, rare organic Since production TADF afterglow requires a certain excitation time, generally indistinguishable FL efficiencies are separated for first time. This work provides novel polymers mechanical properties also will evoke subtle design conjugated molecules to dramatically photoexcitation emission

Language: Английский

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U-shaped configuration design of host materials for solution-processed organic light-emitting diodes

Journal of Materials Science Materials in Electronics, Journal Year: 2025, Volume and Issue: 36(11)

Published: April 1, 2025

Language: Английский

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Engineered Energy Transfer in Room Temperature Phosphorescent Materials for Time‐Resolved Dual‐Mode Encryption

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 12, 2024

Abstract Room temperature phosphorescence (RTP) materials are of significant attentions due to their unique optical properties and potential applications in anti‐counterfeiting information security. However, single spatial resolution decryption methods fail meet high‐level security demands. A novel dual‐mode encryption strategy based on self‐trapped exciton (STE) fluorescence is proposed. By introducing ns 2 metal ions into the zero‐dimensional organic–inorganic hybrid halide (Ph 3 S) SnCl 6 , energy transfer pathways from S 1 T n levels STEs constructed, enabling precise control performance. This material exhibited STE fluorescence‐phosphorescence with different afterglow time, which can be utilized develop high‐performance time‐resolved cryptographic systems. Femtosecond transient absorption experiments indicated that rate significantly affected characteristics long materials. The this systems demonstrated, enhancing through multi‐level providing a new avenue for advanced

Language: Английский

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