Temperature-dependent optical memory for dicyano Ag(I) complexes

INOR 321

Haiyan Lu, Haiyan_Lu@umit.maine.edu1, Sheila Hurley2, Xiaobo Li1, Manal A. Rawashdeh-Omary, momary@twu.edu2, Howard H. Patterson, howardp@maine.edu1, and Mohammad A. Omary, omary@unt.edu3. (1) Department of Chemistry, University of Maine, 5706 Aubert Hall, Orono, ME 04469, (2) Department of Chemistry and Physics, Texas Woman's University, P.O. Box 425859, Denton, TX 76204, (3) Department of Chemistry, University of North Texas, Box 305070, Denton, TX 76203
Single crystals of the layered compound, K2Na[Ag(CN)2]3, exhibit phosphorescence emission bands at 313 and 402 nm. Remarkably, the crystals exhibit "optical memory" in which either an intermediate-energy (IE) violet emission at ~380 nm or low-energy (LE) green emission at ~510 nm is generated upon UV irradiation at cryogenic temperatures. The irradiated crystals reinstate their original luminescence spectrum upon heating to room temperature and then re-cooling, thus illustrating unusual "write/read/erase" changes. Varying the temperature or irradiation wavelength controls whether the LE or IE band appears in the optical writing process. The occurrence of this novel phenomenon has been related to reversible photophysical changes instead of irreversible photochemical changes because irradiation affected only the emission specta and not the excitation spectra. Applications in data storage and temperature sensing are anticipated for K2Na[Ag(CN)2]3 and similar compounds we are pursuing that behave likewise.
 

Spectroscopy of Inorganic Systems
7:00 PM-10:00 PM, Sunday, August 19, 2007 BCEC -- Exhibit Hall - B2, Poster

Division of Inorganic Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007