Project No: 1.1.1.1/19/A/020

Duration: 01.10.2020 – 30.09.2023

Scientific manager: Dr. habil. Phys., Prof. Uldis Rogulis

Project applicant: Institute of solid state physics, University of Latvia

Project partner: Light Guide Optics International, Livani

 

The aim of the project is the development of novel transition metal luminescence based optical materials and prototype for temperature sensing applications.

The project will be implemented in collaboration with a partner organization Light Guide Optics International. The type of the project is industrial, not related to economic activity.

The obtained results will be published in 4 articles in journals indexed in international databases (Scopus, Web of Science) and one patent application. The applicability of the elaborated optical material will be demonstrated by creating an optical temperature sensor prototype. At the beginning of the project the technical readiness level is 2 (TRL 2), and at the end of the project due to development of a prototype, it is planned to reach the 5th technical readiness level (TRL 5).

The total funding of the project is 300 000 EUR, 173 400 EUR of which is ERDF support.

 
 

Project progress

03.10.2022.

Research of Cr activator have been continued and Fe activator research in calcium aluminates have been started. Analysing the electron paramagnetic resonance spectra, it was found that the local structure of Cr3+ ions differs for calcium aluminates of different stoichiometry. Results on the luminescence properties of the Cr activator in calcium aluminates are being prepared for publication in a scientific journal.

A poster was presented on the results of the project at the international conference FMNT-NIBS, Riga, Latvia, July 3-7, 2022; https://fmnt-nibs.lu.lv/.

The first version of the temperature sensor probe layout designed for the transfer of the excitation signal and the collection of the luminescence signal is being developed. We are working to expand the temperature range of the temperature sensor model.


01.07.2022.

Studies of Cr activator in calcium aluminates have been continued. Analysing the electron paramagnetic resonance spectra, it was found that the local structure of Cr3+ ions differs for calcium aluminates of different stoichiometry.

The first scientific article prepared on the results of the project has been published in the journal Optical Materials, 2022, vol.127, p.112352; doi.org/10.1016/j.optmat.2022.112352. A poster report was prepared for presentation at the international conference FMNT-NIBS, Riga, Latvia, 3-7 July 2022; https://fmnt-nibs.lu.lv/. The results of the work are also included in K. Vītols master's thesis, which was successfully defended at the Faculty of Physics, Mathematics and Optometry of the University of Latvia this year, in June.

The first version of the temperature sensor probe layout designed to deliver excitation signal and collect the luminescence signal have been made. The optical and electronic circuit of the temperature sensor model is being improved.


01.04.2022.

Experimental measurements of electron paramagnetic resonance, photoluminescence, photoluminescence excitation spectra and decay kinetics of CaAl4O7: Mn samples were summarized and analysed. Studies of Cr activator in calcium aluminates have been started.

The manuscript of the first scientific publication was prepared and submitted to the journal Optical Materials. A talk was presented at the 38th scientific conference of the University of Latvia CFI and theses are being prepared for submission to the international conference FMNT-NIBS.

Tasks for improving sensor circuit and characteristics have been identified. The optical and electronic circuit of the temperature sensor model is being improved.


03.01.2022.

A detailed analysis of experimental measurements of electron paramagnetic resonance, photoluminescence, photoluminescence excitation spectra and decay kinetics of CaAl4O7: Mn samples obtained so far during the project implementation has been performed.

Based on the results, the draft text of the first scientific publication has been prepared. An abstract is also being prepared for submission to the 38th Scientific Conference of the ISSP, University of Latvia.

The first version of the optical and electronic circuit of the temperature sensor layout has been prepared. The nearest tasks for the improvement of the sensor circuit and characteristics in the direction of prototype development have been set.


01.10.2021.

Numerical modeling of electron paramagnetic resonance (EPR) spectra of CaAl4O7: Mn samples was performed, spin-hamiltonian parameters for Mn2+ centre were determined. A summary of the EPR results has been prepared for the draft publication.

Experimental measurements of photoluminescence spectra and decay kinetics of samples were continued.

An experimental beam of optical fibers has been developed in collaboration with a partner. Testing of prototype optical elements has started.


01.07.2021.

New samples of polycrystalline aluminates activated with manganese ions were synthesized. Experimental measurements and analysis of both the general characterization of the samples, and the characterization of the optical photoluminescence, photoluminescence excitation, decay kinetics and luminescence temperature dependence were continued.

The results of the work were reported in at the international conference “Developments in Optics and Communications” (DOC-2021) in Riga and they are also included in M. Šmite's master's thesis, which was successfully defended at the Faculty of Physics, Mathematics and Optometry of the University of Latvia this year in June.

Work is continuing on the development of an optical temperature sensor prototype. A variant of the optical fiber construction for the light excitation and detection has been developed.


01.04.2021.

Current information in the period from 01.01.2021 to 31.03.2021

The synthesis of new manganese ion-activated aluminate samples was continued. Experimental measurements and analysis of both the general characterization of the samples (X-ray diffraction and electron paramagnetic resonance) and the characterization of the optical properties (photoluminescence, photoluminescence excitation, decay kinetics and luminescence temperature dependence) were continued.

The first results of the work were reported at the annual 37th Scientific Conference of the Institute of Solid State Physics, University of Latvia on February 25 and a poster presentation was submitted at the International Conference “Developments in Optics and Communications” (DOC-2021) in Riga.

Work is continuing on the development of a prototype of the optical temperature sensor.


05.01.2021.

Current information in the period from 01.10.2020 to 31.12.2020

Activity No. 1. Sample synthesis and optimization of their composition.
First aluminate samples activated with transition metal ions have been synthesized. Work is in progress to optimize activator concentrations and conditions of sample synthesis.

Activity No. 2. General characterization of the samples.
First measurements of general characterization of the synthesized samples by X-ray diffraction and electron paramagnetic resonance spectroscopy techniques have been performed.

Activity No. 3. Characterization of optical properties of samples.
Optical characterization of the samples by photoluminescence, photoluminescence excitation, decay kinetics and luminescence temperature dependence techniques has been started.

Activity No. 4. Development of the optical temperature sensor prototype.
First components necessary for an optical temperature sensor prototype have been purchased. Work has begun on the development of a sensor prototype design.