Optically pumped photoluminescence

Figure 10.6 Schematic diagram of the setup for optically pumped photoluminescence measurements. The excitation polarization was varied by a half-wave plate. The emitted light was collected by the CCD spectrometer along the direction parallel to the sample surface. Reproduced from H. Yanagi, 5. Hotta, S. Kobayashi and F. Sas i, Low-dimensional jt-conjugating oligomer crystals - Raman laser action and pulse-shaped emission with time delay, Oyo Buturi, 75, 1471-1475 (2006) with permission of The Japanese Society of Applied Physics...

Photons Photoluminescence Fluorescent lamps, phototherapy lamps, light source, highlighting paints and inks, image intensifier, PLLCD, PDF and other display devices, optically pumped solid-state lasers, up conversion lasers, luminescent solar concentrators, diagnosis... 

The fast kinetics of the photoluminescence emission, picosecond and femtosecond relaxation, in ladder-type polyparaphenylenes is notable [142,143,186], since such measurements reveal stimulated emission and therefore promising aspects for LPPPs as a suitable material for optically pumped solid-state homopolymer lasers as well as for the realization of electrically pumped solid-state polymer lasers [144]. To illustrate the situation we depict the photoluminescence intensity as a function of the excitation power (excitation wavelength A = 295 nm) for... 

Photoluminescence excitation (PLE) spectroscopy was carried out at 77K on oxidized porous silicon containing iron/erbium oxide clusters. The novel PLE spectrum of the 1535 nm Er PL band comprises a broad band extending from 350 to 570 nm and very week bands located at 640, 840, and 895 nm. The excitation at wavelengths of 400 - 560 nm was shown to be the most effective. No resonant PLE peaks related to the direct optical excitation of Er by absorption of pump photons were observed. The lack of the direct optical excitation indicates conclusively that Er is in the bound state and may be excited by the energy transfer within the clusters. 

Xu D et al (1999) Optical absorption and photoluminescence studies of free-standing porous sihcon films with high porosities. J Phys Chem B 103(26) 5468-5471 Xu D, Guo G, Gui L, Tang Y, Qin GS (2000) Optical absorption property of oxidized free-standing porous silicon films. Pure Appl Chem 72(l-2) 237-243 Yao S et al (2006) Electroosmotic pumps fabricated from porous sihcon membranes. J Microelectromech Syst 15(3) 717-728... 

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