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Whispering gallery modes in intrinsic TiO 2 microspheres coupling to the defect‐related photoluminescence after visible excitation
Author(s) -
Paunoiu Andreea,
Moirangthem Rakesh Singh,
Erbe Andreas
Publication year - 2015
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201510012
Subject(s) - photoluminescence , anatase , whispering gallery wave , materials science , dopant , visible spectrum , photoluminescence excitation , excitation , titanium , sol gel , optics , optoelectronics , nanotechnology , photocatalysis , chemistry , doping , resonator , physics , organic chemistry , catalysis , quantum mechanics , metallurgy
Defect‐caused visible photoluminescence after visible excitation in anatase TiO 2 microresonators couples to whispering gallery modes (WGMs). Spherical anatase TiO 2 of a radius between 1.5 µm and 4 µm have been prepared by a sol–gel technique based on hydrolysis of titanium tetrabutoxide. The observation of WGMs in intrinsic anatase TiO 2 without additional dopant offers new perspectives for the localisation of light at TiO 2 surfaces for the design of photocatalysts.WGMs show up as narrow peaks in the photoluminescence spectra of TiO 2 microparticles after visible excitation. (© 2015 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim)