abstract
The sol-gel preparation of a bridged silsesquioxane containing europium(III) salts and 2-thenoyltrifluoroacetone has been achieved from a new ethane tetracarboxamide-based organosilane. Free-standing films with thicknesses up to 440 mu m and maximum absolute quantum yield (q) of 0.34 +/- 0.03 (excitation at 320 nm) were prepared by the drop cast method, while thin films (similar to 200-400 nm) spin-coated on glass substrates led to highly luminescent coatings with q = 0.60 +/- 0.02 (excitation at 345 nm). The thin films were tested as planar luminescent solar concentrators and the optimized device displays an optical conversion efficiency of 12.3% in the absorbing spectral region of the active layer (300-380 nm).
keywords
ORGANIC-INORGANIC MATERIALS; HYBRID MATERIALS; STRUCTURAL EVOLUTION; LANTHANIDE COMPLEXES; RECENT PROGRESS; THIN-FILMS; POLYSILSESQUIOXANES; EUROPIUM(III); UV; POLYCONDENSATION
subject category
Science & Technology - Other Topics; Materials Science
authors
Freitas, VT; Fu, LS; Cojocariu, AM; Cattoen, X; Bartlett, JR; Le Parc, R; Bantignies, JL; Man, MWC; Andre, PS; Ferreira, RAS; Carlos, LD
our authors
Lianshe Fu
Assistant Researcher
Luís Carlos
Full professor
Maria Rute de Amorim e Sá Ferreira André
Full professor
Vânia Patrícia Castro Teixeira Freitas
Research Fellowshipacknowledgements
This work is partially developed in the scope of the projects CICECO - Aveiro Institute of Materials (UID/CTM/50011/2013) and Instituto de Telecomunicacoes (UID/EEA/50008/2013), financed by national funds through the Fundacao para a Ciencia e a Tecnologia/Ministerio da Educacao e Ciencia (FCT/MEC) and when applicable cofinanced by FEDER under the PT2020 Partnership Agreement. The Portugal-France bilateral action (CRUP, TC-11-13), the COST Action MP1202