A Doctoral Dissertation in a New Scientific Field Was Successfully Defended at the Department of General and Inorganic Chemistry

On July 4, 2025, an important academic event took place at the Faculty of Chemistry and Chemical Technology of Al-Farabi Kazakh National University — the successful defense of the doctoral dissertation by PhD candidate Erasyl Aidossuly Zholdas from the Department of General and Inorganic Chemistry under the educational program 8D07104 – Chemical Technology of Inorganic Substances.

The defense was held in the conference hall named after Academician Edil Yergozhayevich Yergozhin.

Dissertation title: “Synthesis of Luminescent Materials in the R₂O₃ – MeO – M₂O – B₂O₃ System (R = Sc, Y, Ce, Eu, Tb, Yb; Me = Sr, Ba; M = Na, K)”

The aim of the research was to synthesize new types of phosphors based on borate matrices and to establish the relationship between their crystal structure and luminescent properties.

Scientific advisors:

PhD, Senior Researcher Aset Kuanyshuly Bolatov (Al-Farabi KazNU); Doctor of Technical Sciences, Professor Alexander Egorovich Kokh (Sobolev Institute of Geology and Mineralogy, Novosibirsk, Russia).

The study resulted in the successful synthesis of novel borate-based phosphors such as KSrY(BO₃)₂ and NaBaSc(BO₃)₂ using different methods. Their phase composition, structural features, and luminescent characteristics were comprehensively investigated. A key finding was the ability to control luminescence color by altering synthesis conditions.

 Practical significance of the research lies in the application potential of the developed phosphors in LED lamps, display technologies, biosensors, and safety systems. These materials contribute to energy efficiency, extended device lifetime, and the development of domestic light source production.

This dissertation introduced a new scientific direction at the department, focused on rare-earth borate-based luminescent materials chemistry, and laid the foundation for further advancements in the field of inorganic materials science.

The work of Erasyl Aidossuly Zholdas enhances the scientific capacity of the department and faculty and provides a solid foundation for the development of next-generation domestic phosphor technologies.

Prepared by:
Mayra Kassenkyzy Kalabayeva,
Candidate of Chemical Sciences