20 February 2018 Luminescent polymethyl methacrylate composite films activated under infrared radiation, useful for engineering applications
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Abstract
Upconversion (UC) luminescence characteristics of Ho3  +  -, Yb3  +  -, and Li  +  -doped Gd2O3 phosphors and composite films of these phosphors into polymethyl methacrylate (PMMA) under continuous wave excitation with 980-nm laser light are reported. The phosphors were synthesized by the simple solvent evaporation technique and characterized by x-ray diffraction and scanning electron microscopy techniques (SEM); SEM observations reveal that these phosphors have a layered structure. The UC emission of these phosphors was the characteristic green UC emission from the Ho3  +   ions, and the effect of Li  +   and Yb3  +   codoping was twofold; (1) lithium’s presence provokes a slight change into Gd2O3 structure, and (2) there is an energy transfer from the Yb3  +   to Ho3  +   ions. The PMMA composite films were synthesized by spin coating technique; they have excellent transparency even after the incorporation of the phosphor content. The UC luminescence CIE coordinates for the phosphors and the PMMA films are at the middle of the “green area” (0.3, 0.6). Phosphors like those are useful for both biological and engineering applications as biomarkers and for solar cell enhancers, respectively.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Karen Jaqueline Martínez Ávila, Salvador Carmona Téllez, Jesús Uriel Balderas Aguilar, Rafael Martínez Matínez, Luis Mariscal Becerra, Ciro Falcony Guajardo, "Luminescent polymethyl methacrylate composite films activated under infrared radiation, useful for engineering applications," Journal of Photonics for Energy 8(1), 014001 (20 February 2018). https://doi.org/10.1117/1.JPE.8.014001 . Submission: Received: 7 November 2017; Accepted: 30 January 2018
Received: 7 November 2017; Accepted: 30 January 2018; Published: 20 February 2018
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