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Modulating Heavy Atom Effect in Germylene for Persistent Room Temperature Phosphorescence.

Wen Dai1, Xiaoang Yang1, Kaiqi Lv2

  • 1State Key Laboratory of Physical Chemistry of Solid Surface, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, 361005, China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|May 31, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed novel germylene-based phosphors exhibiting persistent room temperature phosphorescence (pRTP). The heavy atom effect of germylene enhances light emission, leading to remarkable phosphorescence efficiency and ultralong lifetimes for advanced materials.

Keywords:
Electronic structureGermyleneHeavy atom effectNon-radiative transitionOrganic phosphorescence

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Photophysics

Background:

  • Developing low-valent main group compounds with persistent room temperature phosphorescence (pRTP) remains a significant challenge.
  • Persistent phosphorescence is crucial for various applications, including lighting, sensing, and bioimaging.

Purpose of the Study:

  • To synthesize and characterize novel germylene-based compounds exhibiting pRTP.
  • To investigate the role of low-valent germanium centers and heavy atom effects in phosphorescence properties.
  • To explore the potential of these materials for advanced phosphor applications.

Main Methods:

  • Synthesis of novel germylene derivatives (CzGe, CzGeS, CzGeSe, CzGeAu, CzGeCu).
  • Experimental characterization of photophysical properties, including phosphorescence lifetime and quantum efficiency.
  • Theoretical calculations to elucidate the mechanism of phosphorescence and the influence of the germylene core.

Main Results:

  • Successful synthesis of a series of germylene-based phosphors.
  • Demonstration of 'turn-on' pRTP behavior attributed to the heavy atom effect of the germylene unit.
  • Achieved an ultralong phosphorescence lifetime of 309 ms and a quantum efficiency of 15.84% in a representative germylene phosphor (GeCz).
  • The low-valent state and structural features of GeCz provide a balance between intersystem crossing and heavy atom effects.

Conclusions:

  • Germylene-based compounds are promising candidates for developing efficient persistent phosphors.
  • The heavy atom effect of germylene plays a critical role in enabling and enhancing pRTP.
  • This research offers valuable insights into designing heavy atom-containing phosphors and expands the scope of germylene chemistry.