NDLI: Luminescence Properties of Co-Doped Eu3+, Bi3+ Lu2O3/Polyvinylpyrrolidone Films

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Luminescence Properties of Co-Doped Eu3+, Bi3+ Lu2O3/Polyvinylpyrrolidone Films

Content Provider	MDPI
Author	Ángel De Jesús Morales-Ramírez, Margarita, García-Hernández Dulce, Yolotzin Medina-Velázquez Fernando, Juárez-López Ruiz-Guerrero, María Del Rosario Reyes-Miranda, Joan
Copyright Year	2018
Description	The effect of the polyvinylpyrrolidone (PVP, MW = 130,000) molar content, PVP/Lu = 1, 2.5, 4 and 5; on the photoluminescent and structural properties of sol-gel derived Lu2O3:Eu3+, Bi3+ has been analyzed. Thin hybrid films were deposited by means of the dip-coating technique on silica quartz substrates. Films deposited at 700 °C presented a cubic structure, with non-preferential orientation, even with the presence of PVP. The photoluminescence (PL) spectrum and Comission Internationale de l’Éclairage (CIE) chromaticity diagram of films revealed a reddish Eu3+ emission at 612 nm (5D0 → 7F2) with an excitation at 320 nm of the Bi ions (6s2 → 6s6p), showing a highly-effective energy transfer process form Bi3+ to Eu3+ luminescent centers. On the other hand, the color temperature of the samples is strongly dependent on the PVP content, as a consequence of the observed difference on the branching ratios of 5D0 → 7FJ transitions of europium ions. Lifetime studies present two different behaviors for the thin films: A non-exponential nature for the lower PVP contents, and a simple exponential nature for the highest PVP one, showing that the PVP tends to promote a better dissolution of segregates and, therefore, increases the lifetime of the Eu3+ emission.
Starting Page	434
e-ISSN	20796412
DOI	10.3390/coatings8120434
Journal	Coatings
Issue Number	12
Volume Number	8
Language	English
Publisher	MDPI
Publisher Date	2018-11-27
Access Restriction	Open
Subject Keyword	Coatings Ceramics Lu2o3 Co-doped Eu3+, Bi3+ Photoluminescence Polyvinylpyrrolidone (pvp)
Content Type	Text
Resource Type	Article

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