Non-resonant X-ray/laser interaction spectroscopy as a method for assessing charge competition, trapping and luminescence efficiency in wide band-gap materials

• Published in: Journal of luminescence Vol. 130; no. 8; pp. 1404 - 1414
• Main Authors: Poolton, N.R.J., Bos, A.J.J., Wallinga, J., de Haas, J.T.M., Dorenbos, P., de Vries, L., Kars, R.H., Jones, G.O., Drozdowski, W.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.08.2010; Elsevier
• Subjects: Band spectra; Competition; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Lasers; Luminescence; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; OSL; Other luminescence and radiative recombination; Physics; Radioluminescence; Sodium; Spectroscopy; Trapping; X-rays; TL; OSL; Trapping; Radioluminescence; Experimental device; Charge carrier trapping; Pump probe spectrometry; Stimulated emission; Temperature effects; Phosphors; Laser radiation; Radiation sources; X radiation; Excitation spectrum; Wide band gap semiconductors; Thermoluminescence
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2010.03.002

Using a conventional fast-shuttered laboratory X-ray source in combination with pulsed laser diode modules, the possibilities for undertaking X-ray/laser interaction spectroscopy in wide band-gap luminescent materials are explored. It is shown that in such materials, a variety of X-ray/laser timing sequences can extract complimentary information regarding the charge-carrier trapping, de-trapping and recombination processes. The effects on the luminescence are illustrated for six example materials (YPO 4:Ce,Sm, Lu 3Al 5O 12:Pr, Al 2O 3:C, natural sodium feldspar NaAlSi 3O 8, cubic BN and type IIa natural diamond). By ramping the temperature from 10 to 320 K during repeated X-ray pump/laser-probe activation cycles, a rapid assessment can be made of the important thermally dependent changes to the charge carrier trapping competition processes.