화학공학소재연구정보센터
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, Vol.252, 351-359, 1994
Non-Site-Selective Excitation of a Doped Dye and Laser-Induced Hole Filling in Photochemical Hole-Burning
The mechanism of laser-induced hole filling (LIHF) in photochemical holeburning is discussed qualitatively and quantitatively based on non-site-selective excitation of a doped dye. The dye molecules used were sulfonated tetraphenylporphine and disodium mesoporphyrin, both embedded in poly(vinyl alcohol). Experimental temperatures were in the range 4-20 K. The extent of LMF at wavelengths shorter than the wavelength of a newly irradiating laser has a monotonically decreasing dependence on the increase in wavelength difference and reflects the degree of thermal excitation in the S-0 state. On the other hand, the wavelength dependence of the extent of LMF at wavelengths longer than the wavelength of a newly irradiating laser exhibits two peaks, reflecting the energy levels in the S-1 state. It also depends on the experimental temperature. Besides these dependences, the extent of LMF also depends on the molecular structure of the doped dye.