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Description:

Bright triboluminescence (TL) of lanthanideIII dinuclear complexes was observed regardless of their photoluminescence (PL) efficiencies under UV irradiation. A β-diketonate ligand with tert-butyl groups (tmh) was incorporated to quench the EuIII-centered PL through ligand-to-metal charge transfer state, while tmh provides efficient photosensitization effect for TbIII ions. TL intensities of EuIII and TbIII complexes were in the same order even though the PL quantum yields dif-fered by > 50 times. Nanomechanical tests revealed the characteristic smooth load-displacement profiles, which would be ideal to accumulate the deformation right before the breakage of the crystals. TL/PL color difference was also observed in a heterodinuclear TbIII/EuIII complex, and further grinding gave mechanochromic luminescence (MCL), being the first ex-ample of TL-MCL-active lanthanideIII coordination system. The photophysical properties before/during/after grinding were investigated and correlated with the crystallographic data of powders and single crystals.

Rights:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: stimuli responsive mateirlas, luminescence, nanoindentation, stress sensor, solid mechanics

Date published: 2023-02-08

Publisher: Wiley

Journal:

• Advanced Optical Materials (ISSN: 21951071) vol. 11 issue. 9 2203139

Funding:

• JSPS 22K14661 (ナノインデンテーション試験による刺激応答性発光分子の機械特性の解明)
• JSPS 17H04873 (微小反応場を用いるトリボ発光性希土類配位高分子材料の深化)
• JSPS 20H02748 (力学的な刺激により励起反応を誘起できる希土類錯体の構築)
• JSPS 21H02031 (単一粒子分光解析を用いた希土類配位結晶の刺激発光機能の解明)
• JSPS 21K18969 (力学的な刺激で光エネルギーを蓄積できる錯体の開発)
• ERC 715757 (MECHANO-FLUO)

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1002/adom.202203139

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Updated at: 2024-07-04 16:30:29 +0900

Published on MDR: 2024-07-04 16:30:29 +0900