Instrumentation for computer-controlled dye-laser spectroscopy of phosphor powders
1985; Elsevier BV; Volume: 33; Issue: 3 Linguagem: Inglês
10.1016/0022-2313(85)90001-8
ISSN1872-7883
Autores Tópico(s)Analytical Chemistry and Sensors
ResumoThe present article reviews initially the performance characteristics of a commercial nitrogen-laser-pumped pulsed dye laser, utilized for the determination of spectral parameters of phosphors for lighting applications. Subsequently, we describe TTL-based instrumentation, that we have designed and built for driving the cavity grating of the dye laser, thereby making it possible to measure excitation spectra for phosphor emission under dye-laser excitation. Next, we detail a feedback system we have devised to optimize the process of second-harmonic generation (SHG) of the visible dye-laser output. These additions to the commercial dye-laser system have resulted in the short-UV extension of the capability to measure excitation spectra for phosphor emission. We then review in detail various TTL-based schemes, that we have developed to measure, store, process and display spectral properties of powders of phosphor materials, measured over the temperature range from 300 K to ≅ 4 K, under direct control by the Central Computer of the GTE Laboratories. The connection between the Central Computer and the dye-laser system and ancillary detection equipment was realized by means of an IBM 7406 Device Coupler and a variety of additional interfaces. Finally, we present examples of time-resolved emission and excitation spectra, and of emission-decay curves, for the case of Y2O3: Eu lamp phosphors, displayed by means of a Tektronix 4662 Digital Plotter.
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