Diode-Laser-Pumped 551-nm Upconversion Laser in YLiF4;Er3+
T. Herbert, W.P. Risk, et al.
ASSL 1990
The polarized emission spectra of melt and vapor grown single crystals of carefully purified 9-cyanoanthracene (9-CNA) are reported. This materials has a quasi one-dimensional structure with molecules stacked along the c-axis. In crystals previously unirradiated at room temperature, the emission is excimer-like with a double peak (550 nm, E⊥c) and (525 nm, E|c) at 2 K, and a single peak at 300 K (588 nm, E, |c). Exposure to UV radiation at room temperature induces fluorescence associated with the production of photodimers. At 2 K this fluorescence is highly structured and coexists with excimer emission. It also extends to higher energies than the origin of the exciton band of the first singlet, supporting a model in which this component of the fluorescence arises from 9-CNA molecules separated from bulk by a matrix of photodimers. The photoproduct thus acts somewhat like a Shpol'skii matrix for these unreacted molecules. © 1976.
T. Herbert, W.P. Risk, et al.
ASSL 1990
R.M. Macfarlane, E.A. Whittaker, et al.
Electronics Letters
G. Pacchioni, P.S. Bagus, et al.
Zeitschrift für Physik D Atoms, Molecules and Clusters
M. Levenson, R.M. Macfarlane, et al.
Physical Review B