Automated measurement setup for measuring the Efficiency of perovskite light emitting diodes

Avtomatizacija meritvenih postopkov in digitalizacija merjenih podatkov pospešita proces opravljanja meritev in obdelavo podatkov. Za izvajanje avtomatskih ali polavtomatskih meritev perovskitnih svetlobnih diod (ang.: light emitting diodes – LED) potrebujemo programsko opremo, ki nadzoruje in upravlja merilni instrument, napajalnik in drugo strojno opremo. Poleg komunikacije med osebnim računalnikom in strojno opremo je potreben tudi uporabniški vmesnik, ki omogoča učinkovito upravljanje in nadzor merilnega sistema. Poleg merjenja podatkov je pomembno tudi shranjevanje in nadaljnja obdelava merjenih podatkov. Merilni sistem je sestavljen iz spektrometra Ocean Optics HR2000+, za napajanje skrbi napajalnik Agilent E3634A, ki preko tiskanega vezja s šestimi releji napaja perovskitne LED. Za nadzor strojne opreme in komunikacije z njo smo uporabili programski jezik Python. Uporabniški vmesnik je zgrajen z orodjem PyQt6, ki omogoča gradnjo grafičnih vmesnikov Python. Za oblikovanje in izgradnjo grafičnega uporabniškega vmesnika smo uporabili Qt Designer. Programsko kodo smo razdelili v razrede glede na funkcije, ki jih opravlja. Taka razdelitev omogoča boljšo organizacijo kode in lažjo nadgradnjo programa. Razvita programska oprema poleg ročnih meritev omogoča izvajanje avtomatskih meritev spektra, kjer se ob preletu napetosti oz. toka za vsak korak opravi meritev. Za vrednotenje stabilnosti delovanja diod, program omogoča izvajanje časovno nastavljivih osnovnih meritev, kjer se podatki shranjujejo ob izbranih časih med dolgotrajnim delovanjem. Ob izvajanju meritev se podatki shranjujejo v bazo podatkov MySQL in v datoteke v tekstovni obliki. Shranjujejo se vsi izmerjeni podatki in preračunane vrednosti, kot so svetilnost, svetlobna moč in zunanja kvantna učinkovitost.Automation of measurement procedures and digitalization of measured data accelerates the process of performing measurements and data processing. To perform automatic or semiautomatic measurements we need software that can control and manage the measuring instruments, power supply and other hardware. In addition to the communication between the PC and the hardware, a user interface is also required, which enables efficient management and control of the measurement system. It is also important to store and further process the measured data. The selected Python programming language is used to control and communicate with hardware. It is also used to build the user interface. The program code is divided into classes based on the functions it performs, which allows for better code organization and easier program upgrades. In the master’s thesis, a measurement system for spectral analysis of perovskite LEDs is described. The measurement system consists of an Ocean Optics HR2000+ spectrometer, power supply Agilent E3634A that powers perovskite LED through a printed circuit board with six relays. The user interface is built with the PyQt6, which allows building Python graphical interfaces. Qt Designer was used for designing and building the graphical user interface. The developed software enables manual measurements as well as automatic spectrum measurements, where a measurement is performed for each step during voltage or current sweep. For evaluating the stability of diode operation, the program allows performing timeadjustable basic measurements, where data is stored at selected times during long-term operation. When performing measurements, the data is stored in a MySQL database and in text files. All measured data and calculated values, such as luminance, light power, and external quantum efficiency, are stored