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Photoluminescence: Applications01:14

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Ultralong Room-Temperature Phosphorescence from Boric Acid.

Haoyue Zheng1, Peisheng Cao2, Yanying Wang1

  • 1State Key Laboratory of Hydraulics and Mountain River Engineering, Analytical & Testing Center, Sichuan University, Chengdu, 610064, China.

Angewandte Chemie (International Ed. in English)
|February 17, 2021
PubMed
Summary

Researchers discovered boric acid, a carbon-free material, exhibits long-lived room-temperature phosphorescence (RTP). This finding opens new avenues for developing novel RTP materials beyond traditional carbon-based compounds.

Keywords:
boric acidboronelectronic communicationlone pair electronsroom temperature phosphorescence

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Area of Science:

  • Materials Science
  • Photophysics
  • Inorganic Chemistry

Background:

  • Long-lived phosphors traditionally rely on rare earth/transition metal-doped sulfides and oxides.
  • Recent advances include organic materials with carbon skeletons for room-temperature phosphorescence (RTP).

Purpose of the Study:

  • To explore non-metal, carbon-free materials for long-lived room-temperature phosphorescence (RTP).
  • To investigate the mechanism and potential of boric acid and related boron compounds as RTP emitters.

Main Methods:

  • Synthesis and characterization of boric acid and related boron compounds.
  • Photoluminescence spectroscopy to study emission properties and lifetimes.
  • Computational analysis to understand the electronic structure and excitation mechanisms.

Main Results:

  • Boric acid demonstrated RTP with a lifetime up to 0.3 seconds.
  • Weak conjugation within the B-O confined space is proposed as the origin of RTP.
  • Similar RTP was observed in BN and BF3 (BF4-).
  • The vacant B orbital plays a crucial role in the excitation process, distinct from previous findings.

Conclusions:

  • Boric acid and related boron compounds are novel, carbon-free materials for RTP.
  • Boron's unique electronic properties make it a versatile motif for designing new phosphorescent materials.
  • This work expands the scope of materials for RTP applications beyond organic and traditional inorganic phosphors.