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7621777 
Journal Article 
Triboluminescence of trans-stilbene, p-terphenyl and polycyclic aromatic hydrocarbons 
Tukhbatullin, AA; Sharipov, GL; , 
2020 
1 
Optical Materials
ISSN: 0925-3467 
ELSEVIER 
AMSTERDAM 
109 
110402 
English 
WOS:000590138300002 
The luminescence of trans-stilbene, p-terphenyl and polycyclic aromatic hydrocarbons (PAHs) during the me-chanical grinding of microcrystals in a working cell is studied. The triboluminescence of trans-stilbene, p-ter phenyl, naphthalene, anthracene, pyrene, and coronene was detected. No triboluminescence spectrum of tetracene was recorded because of low intensity. No gas component of a triboluminescence spectrum (the lines of N-2 molecules and atoms of inert gases) was recorded for all polyaromatic hydrocarbons in air and inert gases (Ne, Ar, and Kr). The bands coinciding with fluorescence spectra of trans-stilbene, p-terphenyl, naphthalene, and anthracene are observed in their triboluminescence spectra during the mechanical grinding of their crystals. High-intensity luminescence of excimers is observed in the triboluminescence spectrum of pyrene and coronene, and there is no luminescence of their monomers. Stable triboluminescence of a pyrene monomer, however, is observed during the grinding of a 200:1 naphthalene/pyrene microcrystal mixture, and it appeared due to the transfer of excitation energy from a naphthalene molecule to pyrene one. The triboluminescence of tetracene was also detected in an anthracene/tetracene mixture. A mechanism of triboluminescence of trans-stilbene, p-ter phenyl and PAHs is proposed as electroluminescence arising due to recombination of charge carriers in the electric field of a crystalline layer electrified during the grinding. 
Coronene; Excimer emission; Polycyclic aromatic hydrocarbons; Pyrene; Trans-Stilbene; Triboluminescence