Artigo
Investigations on PVP/Y3BO6:Eu3+, a red Luminescent composite for lighting devices based on near UV-LEDs
Registro en:
Journal Of Materials Chemistry C. Cambridge: Royal Soc Chemistry, v. 2, n. 31, p. 6301-6311, 2014.
2050-7526
10.1039/c4tc00560k
WOS:000340353700008
5584298681870865
0000-0002-8356-8093
Autor
Pradal, Nathalie
Boyer, Damien
Chadeyron, Genevieve
Therias, Sandrine
Chapel, Anthony
Santilli, Celso Valentim [UNESP]
Mahiou, Rachid
Resumen
This work deals with a red phosphor. Y3BO6:Eu3+, and its corresponding poly(N-vinylpyrrolidone) (PVP)/Y3BO6:Eu3+ luminescent composite film suitable for applications in the next generation of Hg-free lamps based on near ultraviolet (UV) light emitting diodes (LEDs). Well crystallized samples of Y3BO6 powders with the Eu3+ content up to 20 mol% were prepared by the Pechini method. After structural, morphological and optical characterization, the best doping rate of Eu3+ in the matrix was determined to be 15 mol%. This optimal powder, which is highly friable, was easily ground into fine particles and homogeneously dispersed into a PVP polymer solution to give rise to a polymer phosphor composite. Structural and optical features of the composite film have been studied and compared to those of a pristine PVP film and Y3BO6:Eu3+ powder. All the characterization (XRD, SAXS, luminescence...) proved that the red phosphor particles are well incorporated into the polymer composite film which exhibited the characteristic red emission of Eu3+ under UV light excitation. Furthermore, photostability of the polymer/phosphor composite film under UV-LED irradiation was evaluated from exposure to accelerated artificial photoageing at wavelengths above 300 nm. Univ Clermont Ferrand, ENSCCF, Inst Chim Clermont Ferrand, F-63000 Clermont Ferrand, France Univ Clermont Ferrand, Univ Clermont Ferrand 2, Inst Chim Clermont Ferrand, F-63000 Clermont Ferrand, France CNRS, UMR 6296, ICCF, F-63171 Aubiere, France UNESP, Inst Quim, BR-14800900 Araraquara, SP, Brazil UNESP, Inst Quim, BR-14800900 Araraquara, SP, Brazil