Radiometric analysis of UV to near infrared LEDs for optical sensing and radiometric measurements in photochemical systems

Radiometric analysis of UV to near infrared LEDs for optical sensing and radiometric measurements in photochemical systems

Článek WoS

LEDs have been established as light sources in countless areas of optical sensing and chemical analysis, where they offer a better alternative to traditional light sources in terms of low-cost, small size and robustness. We present comprehensive radiometric analysis of LEDs in terms of absolute emission spectra, radiometric power output, irradiances, radiant efficiencies as well as uncertainties. This allowed us to develop and cross-validate a rapid, facile, accurate and low-cost radiometric analysis of LEDs with directional light output using a large active area silicon photodiode in a simple optical design with the LED light source in proximity, without the need for a calibrated light source. We demonstrate that data for a wide range of 21 commercial LEDs in UV, vis and NIR spectral range (255–950 nm) agree very well with two entirely independent approaches. First, we obtained an excellent agreement with accuracy within 5% for radiometric power output measured using chemical actinometric methods. Further, we obtained irradiance (mW/cm2) and radiant efficiency values (%) for the LEDs. It is demonstrate that facile, accurate and low-cost radiometric analysis can be further extended to accurately measure quantum yield of photochemical reactions and fluence values in actinometric systems.

LEDs have been established as light sources in countless areas of optical sensing and chemical analysis, where they offer a better alternative to traditional light sources in terms of low-cost, small size and robustness. We present comprehensive radiometric analysis of LEDs in terms of absolute emission spectra, radiometric power output, irradiances, radiant efficiencies as well as uncertainties. This allowed us to develop and cross-validate a rapid, facile, accurate and low-cost radiometric analysis of LEDs with directional light output using a large active area silicon photodiode in a simple optical design with the LED light source in proximity, without the need for a calibrated light source. We demonstrate that data for a wide range of 21 commercial LEDs in UV, vis and NIR spectral range (255–950 nm) agree very well with two entirely independent approaches. First, we obtained an excellent agreement with accuracy within 5% for radiometric power output measured using chemical actinometric methods. Further, we obtained irradiance (mW/cm2) and radiant efficiency values (%) for the LEDs. It is demonstrate that facile, accurate and low-cost radiometric analysis can be further extended to accurately measure quantum yield of photochemical reactions and fluence values in actinometric systems.

Chemical actinometry, Irradiance and radiant efficiency, Light emitting diodes (LEDs), Optical sensing, Quantum yield and fluence, Radiometric power output

Chemical actinometry, Irradiance and radiant efficiency, Light emitting diodes (LEDs), Optical sensing, Quantum yield and fluence, Radiometric power output

Noori, A.;Mahbub, P.;Dvořák, M.;Lucieer, A.;Macka, M.

2019

01.06.2018

Elsevier

0925-4005

SENSORS AND ACTUATORS B-CHEMICAL

262

1

Švýcarská konfederace

171

179

9

https://www.sciencedirect.com/science/article/pii/S0925400518302028?via%3Dihub

A149 Noori et al Radiometric analysis of UV to.. SNB 262 (2018) 171–179 ...