Lh. Slooff et al., Concentration effects in the photodegradation of lissamine-functionalized neodymium complexes in polymer waveguides, J OPT SOC B, 18(11), 2001, pp. 1690-1694
The photodegradation of lissamine-functionalized Nd complexes doped at a co
ncentration of 10 wt. % in a fluorinated polycarbonate waveguide has been s
tudied. On illumination at 458 nm and at 488 nm, the luminescence spectrum
of the lissamine sensitizer shifts to shorter wavelengths, while the lumine
scence intensity first increases and then decreases. The spectral shape of
the Nd luminescence does not change on illumination, and the luminescence i
ntensity shows a gradual decrease as a function of time. The difference in
response between the lissamine and the Nd luminescence can be described by
a model that assumes the existence of two different types of complex. One t
ype exhibits energy transfer from the lissamine to the neodymium. ion, with
a large lissamine intersystem crossing rate, and hence low sensitivity to
concentration quenching. The other type does not show energy transfer to Nd
, and does experience concentration quenching. (C) 2001 Optical Society of
America.