Photoluminescence measurement of ruby excited by duty ratio-controlled pulse light-emitting diodes (LED) light source

Ami Hitomi; Toru Katsumata; Hiroaki Aizawa

doi:10.1063/5.0208864

Photoluminescence measurement of ruby excited by duty ratio-controlled pulse light-emitting diodes (LED) light source

Rev Sci Instrum. 2024 May 1;95(5):054901. doi: 10.1063/5.0208864.

Authors

Ami Hitomi¹, Toru Katsumata^{1

2}, Hiroaki Aizawa^{1

2}

Affiliations

¹ Graduate School of Science and Engineering, Toyo University, 2100 Kujirai, Kawagoe, Saitama 350-8585, Japan.
² Faculty of Science and Engineering, Toyo University, 2100 Kujirai, Kawagoe, Saitama 350-8585, Japan.

PMID: 38748816
DOI: 10.1063/5.0208864

Abstract

Photoluminescence (PL) spectra from ruby were obtained using a highly stable LED light source, employing pulse width modulation technique for excitation. The temporal variation in PL intensity caused by the increasing temperature of the LED used for excitation can be mitigated by adjusting the duty ratio (%) of the pulsed LED light to below 10% for cooling the LED. Stable PL spectra measurements were achieved with a duty ratio of less than 10% using a duty ratio-controlled pulsed LED light source, as temperature fluctuations in LED light intensity are minimized at duty ratios less than 10%. Furthermore, fluctuations in the measured PL intensity were diminished by setting the frequency of the pulsed LED light source to greater than 1 kHz. This method enables more reliable, cost-effective, and stable PL measurements for material characterization in semiconductors, photonics, and nanotechnology.