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Pure Boric Acid Does Not Show Room-Temperature Phosphorescence (RTP).

Zhu Wu1, Juan Carlos Roldao2, Florian Rauch1

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Summary

Pure boric acid (BA) does not exhibit room-temperature phosphorescence (RTP). Trace impurities, not the BA itself, are responsible for the RTP phenomenon observed in previous studies.

Keywords:
Boric AcidImpurityPhosphorescenceTD-DFTTriplet

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Optical Materials

Background:

  • Boric acid (BA) is a long-established transparent glass matrix for optical applications.
  • Recent reports suggested BA exhibits room-temperature phosphorescence (RTP) under specific irradiation conditions.

Purpose of the Study:

  • To investigate the source of room-temperature phosphorescence (RTP) in boric acid (BA).
  • To determine if pure BA exhibits RTP or if impurities are responsible.

Main Methods:

  • Synthesis of pure BA from B(OMe)3.
  • Experimental luminescence measurements of pure and commercial BA under UV irradiation (250-400 nm).
  • Theoretical calculations of BA light absorption properties.

Main Results:

  • Pure BA, synthesized and tested, showed no luminescence in the solid state when irradiated between 250-400 nm.
  • Commercial BA samples exhibited faint luminescence, suggesting impurity presence.
  • Theoretical and experimental data confirmed pure BA does not absorb light above 200 nm, precluding excitation at >250 nm.

Conclusions:

  • Pure boric acid does not exhibit room-temperature phosphorescence (RTP).
  • The previously reported RTP in BA is attributable to trace impurities within the material.
  • Understanding impurity effects is crucial for optical material characterization.