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SrY2O4:Ce(III),Ln(III) (Ln = Eu, Tb): phosphor via modified Pechini method for the production of phosphor-converted mini and micro-LEDs applicable in self-emissive displays

Grant number: 22/08409-4
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): December 01, 2022
Effective date (End): July 31, 2023
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Inorganic Chemistry
Principal Investigator:Ana Maria Pires
Grantee:Leonardo Figueiredo Saraiva
Host Institution: Faculdade de Ciências e Tecnologia (FCT). Universidade Estadual Paulista (UNESP). Campus de Presidente Prudente. Presidente Prudente , SP, Brazil

Abstract

With the technological advance of optical devices, display technology has become indispensable today, increasing the demand for high performance. In this context, micro-LEDs have been considered the next generation of this technology because of their low power consumption and wide color gamut, compared to the liquid crystal display (LCD) and OLEDs currently in use. In this technology, the red, green, and blue (RGB) pixels are obtained by using color filters, which decompose the white light generated by the combination of phosphors emitting these colors. Thus, phosphors doped with rare-earth ions (lanthanide group including scandium and yttrium), exhibit high potential to be applied in these devices to result in self-emissive displays (which do not require a backlight). In general, luminescent materials based in inorganic lattices such as oxides, are produced by doping with rare-earth ions that tend to replace cations with similar characteristics in these host lattices. Therefore, in this work, we aim to investigate the structural, morphological, and spectroscopic properties of SrY2O4 co-doped with Ce3+ and Eu3+ or Tb3+ synthesized via the modified Pechini method. Unlike what is found in the literature, the polymerizing agent Sorbitol will be used, which enhances the photoluminescent properties of the material. The proposed phosphors, after their characterization and modulation of the structural and optical properties, will then be used in the fabrication via the drop-casting technique of light-emitting nanostructured films based on polymethyl methacrylate (PMMA) polymer applicable in the construction of the emitting layer of micro-LEDs to obtain RGB pixels by the use of a color filter.

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