Study of the Light Emitting Diode as a photoreceptor : spectral and electrical characterization as function of temperature and lighting source

• Autorzy: Vannacci E. , Granchi S. , Cecchi M. , Calzolai M. , Mazzi E. , Biagi E.

Identyfikatory

DOI

10.1016/j.opelre.2018.06.001

• Języki publikacji: EN

Abstrakty

EN

In this study, the temperature influence on the spectral responsivity of a Light Emitting Diode (LED) used as a photoreceptor, combined to light source spectrum is correlated to electrical characteristics in order to propose an alternative method to estimate LED junction temperature, regardless of the absolute illumination intensity and based on the direct correlation between the integral of the product of two optical spectra and the photo-generated currents. A laboratory test bench for experimental optical measurements has been set in order to enable any characterizing of photoelectric devices in terms of spectral behaviour, in a wavelength range placed between 400–1000 nm, and of current-voltage characteristics as function of temperature by using two different illumination sources. The temperature is analysed in a range from 5°C up to 85°C, so as to evaluate thermal variation effects on the sensor performance. The photo-generated current of two LEDs with different peak wavelengths has been studied. Research has observed and mathematically analysed what follows: since the photo-generated current strictly depends on the combination between the spectral response of the photoreceptor and the lighting source response, it becomes possible to estimate indirectly the junction temperature of the LEDs by considering the ratio between the photogenerated currents obtained by using two different illumination sources. Such results may for one thing increase knowledge in the fields where LEDs are used as photo-detectors for many applications and for another, they could be extended to generic photodetectors, thus providing useful information in photovoltaic field, for instance.

Słowa kluczowe

EN

light emitting diode; photovoltaic effect; current voltage characteristic; photodetector; junction temperature; spectral analysis

• Wydawca: Stowarzyszenie Elektryków Polskich ; Polska Akademia Nauk ; Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
• Czasopismo: Opto-Electronics Review
• Rocznik: 2018
• Tom: Vol. 26, No. 3
• Strony: 201--209
• Opis fizyczny: Bibliogr. 40 poz., rys., wykr.

Twórcy

autor

Vannacci E.

• Department of Information Engineering (DINFO), University of Florence, Via Santa Marta, 3, 50139, Florence, Italy

autor

Granchi S.

• Ultrasound and Non-Destructive Testing Lab, Department of Information Engineering (DINFO), University of Florence, via Santa Marta 3, 50139, Florence, Italy

autor

Cecchi M.

• Department of Information Engineering (DINFO), University of Florence, Via Santa Marta, 3, 50139, Florence, Italy

autor

Calzolai M.

• Department of Information Engineering (DINFO), University of Florence, Via Santa Marta, 3, 50139, Florence, Italy

autor

Mazzi E.

• Power Pure Control s.r.l., Via Carbonia, 2, 56021, Navacchio, Pisa, Italy

autor

Biagi E.

• Department of Information Engineering (DINFO), University of Florence, Via Santa Marta, 3, 50139, Florence, Italy

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).