Photon Echo and Time-Resolved Fluorescence Anisotropy Measurements of Organically Doped Sol-Gel Glasses

We present time resolved measurements of homogeneous dephasing of organic dopants in inorganic sol-gel glasses. A variety of organically doped sol-gel glasses have been synthesized and their dynamics investigated by time-resolved photon echo and fluorescence anisotropy measurements. The homogeneous dephasing rate of the chromophore is determined from photon echo measurements at low temperature (T = 1.4 K), while thermally activated homogeneous dephasing mechanisms are investigated by temperature dependent photon echo measurements. Our results are contrasted with recent hole-burning experiments on doped sol-gel glasses. Aluminosilicate (ASE) and tetraethoxy silane (TEOS) glasses have been doped with rhodamine dyes, polyaromatics, cresylviolet, resorufin and a wide range of chromophores with different nonradiative electronic relaxation rates. A small list includes naphthalene (170ns), rhodamine 6G (2ns), Rose Bengal (500ps), stilbene (70ps), azulene (2ps), as well as quinizarin and chlorin. The visible absorption spectra of some organically doped sol-gel glasses is shown. The low temperature homogeneous dephasing rate for chromophores doped into TEOS and in ASE sol-gel glasses has been measured utilizing photon echo measurements. This article is from 'Organization of the Optical Society of America Photonic Science Topical Meeting Series (1991). Volume 16. Conference Edition: Summaries of papers presented at the Persistent Spectral Hole-Burning: Science and Applications Topical Meeting Held in Monterey, California on 26-28 September 1991', AD-A258 663, p15-17