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Color-Tunable Polymeric Long-Persistent Luminescence Based on Polyphosphazenes.

Zhonghao Wang1, Yongfeng Zhang1, Chang Wang1

  • 1School of Materials Science and Engineering, Chongqing University of Technology, Chongqing, 400054, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|January 14, 2020
PubMed
Summary

Researchers developed novel polymeric long-persistent luminescence (PLPL) materials. These materials exhibit excitation-dependent color changes from blue to green and dynamic luminescence cycles under ambient conditions.

Keywords:
color tunabilityexcitation-dependent luminescencelong-persistent luminescencepolyphosphazenesroom-temperature phosphorescence

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Organic long-persistent luminescence (OLPL) materials are crucial for applications like bioimaging and anti-counterfeiting.
  • Existing OLPL materials often lack dynamic and excitation-dependent properties.
  • Strategies to enhance intersystem crossing (ISC) and limit nonradiative transitions have yielded materials with long lifetimes and high quantum yields.

Purpose of the Study:

  • To design and synthesize novel polyphosphazene derivatives for polymeric long-persistent luminescence (PLPL).
  • To achieve excitation-dependent PLPL (ED-PLPL) with tunable colors under ambient conditions.
  • To explore dynamic luminescence cycles in polymeric systems.

Main Methods:

  • Synthesis of two novel polyphosphazene derivatives incorporating carbazolyl units.
  • Doping of synthesized materials into poly(vinyl alcohol) (PVA) films.
  • Characterization of luminescence properties, including excitation-dependent emission and dynamic behavior.

Main Results:

  • Successful synthesis of polyphosphazene derivatives and their incorporation into PVA films.
  • Observation of excitation-dependent PLPL (ED-PLPL) under ambient conditions (room temperature, air).
  • Tunable persistent luminescence color from blue to green by altering excitation wavelength.
  • Realization of a dynamic cycle of ED-PLPL driven by reversible hydrogen bonding interactions.

Conclusions:

  • The study presents a new strategy for creating color-tunable polymeric luminescent materials.
  • The developed materials exhibit dynamic and excitation-dependent luminescence under ambient conditions.
  • The findings open avenues for advanced applications in displays, security, and sensing.