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Evidence of Organic Luminescent Centers in Sol-Gel-Synthesized Yttrium Aluminum Borate Matrix Leading to Bright Visible Emission

Evidence of Organic Luminescent Centers in Sol-Gel-Synthesized Yttrium Aluminum Borate Matrix Leading to Bright Visible Emission

Pauline Burner, Atul D Sontakke, Mathieu Salaün, Michel Bardet, Jean-Marie Mouesca, Serge Gambarelli, Anne-Laure Barra, Alban Ferrier, Bruno Viana, Alain Ibanez, Vincent Maurel, Isabelle Gautier-Luneau

Angew Chem Int Ed Engl. 2017 Nov 6;56(45):13995-13998.

PMID: 28892584

Abstract:

Yttrium aluminum borate (YAB) powders prepared by sol-gel process have been investigated to understand their photoluminescence (PL) mechanism. The amorphous YAB powders exhibit bright visible PL from blue emission for powders calcined at 450 °C to broad white PL for higher calcination temperature. Thanks to 13 C labelling, NMR and EPR studies show that propionic acid initially used to solubilize the yttrium nitrate is decomposed into aromatic molecules confined within the inorganic matrix. DTA-TG-MS analyses show around 2 wt % of carbogenic species. The PL broadening corresponds to the apparition of a new band at 550 nm, associated with the formation of aromatic species. Furthermore, pulsed ENDOR spectroscopy combined with DFT calculations enables us to ascribe EPR spectra to free radicals derived from small (2 to 3 rings) polycyclic aromatic hydrocarbons (PAH). PAH molecules are thus at the origin of the PL as corroborated by slow afterglow decay and thermoluminescence experiments.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP14060301	Yttrium borate		14060-30-1	Price

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