ATTENTION: This site is down for maintenance in read-only mode.

The following is an abstract for the selected article. A PDF download of the full text of this article is available here. Members may download full texts at no charge. Non-members may be charged a small fee for certain articles.

Micro- and Sub-nanosecond Lifetime Measurements Using a UV Light-Emitting Diode

Volume 54, Number 1 (Jan. 2000) Page 106-109

Szmacinski, Henryk; Chang, Qing

The authors describe the use of an ultraviolet light-emitting diode (UV LED), Nichia NSHU590E, as a 373 nm excitation light source for fluorescence lifetime measurements. A frequency-domain technique has been chosen to demonstrate that the UV LED can be efficiently intensity modulated by driving the radio-frequency signal over a range of modulation frequencies from 10 kHz up to 330 MHz. Time-resolved measurements have been performed by using a fluorophore with a very long lifetime of 10.2 mu s and fluorophore with a very short lifetime of 0.15 ns. Application of LEDs for lifetime-based chemical sensing is discussed.