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The Relationship of Solid‐State Plasticity to Mechanochromic Luminescence in Difluoroboron Avobenzone Polymorphs
Author(s) -
Krishna Gamidi Rama,
Kiran Mangalampalli S. R. N.,
Fraser Cassandra L.,
Ramamurty Upadrasta,
Reddy Chilla Malla
Publication year - 2013
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201201896
Subject(s) - cyan , materials science , luminescence , fluorescence , solid state , nanoindentation , supramolecular chemistry , photochemistry , chemical physics , crystal structure , optoelectronics , crystallography , optics , composite material , chemistry , physics
Abstract In solid‐state mechanochromic luminescence (ML) materials, it remains a challenge to establish the origin of fluorescence color changes upon mechanical action and to determine why only some fluorophores exhibit ML behavior. The study of mechanical properties by nanoindentation, followed by ML experiments on green‐ and cyan‐emitting polymorphs of difluoroboron avobenzone reveals that upon smearing, the plastically deformable cyan form shows a prominent color change to yellow, while in the harder green form the redshifted emission is barely detectable. Crystal structure analysis reveals the presence of slip planes in the softer cyan form that can facilitate the formation of recoverable and low energy defects in the structure. Hence, the cyan form exhibits prominent and reversible ML behavior. This suggests a potential design strategy for efficient ML materials.