Recording Spectroradiometers for Luminescent Materials

Abstract

Instrumentation programs for the careful measurement of spectral energy distributions emitted by luminescent materials have been an important part of Sylvania's research activities for a number of years. Accurate knowledge of these properties is of value not only in the study of the fundamentals of the luminescent process, but also in the development and manufacturing control of the phosphors used in fluorescent lamps and in cathode‐ray tubes.The objective of this paper is to describe a pair of automatic recording spectro‐radiometers developed for the two foregoing products. These instruments have been installed in phosphor development laboratories. Their construction, operation, and uses are critically discussed. Both instruments provide for the direct measurement of spectral energy in the region between 7200 and 3600 Å. The fluorescent lamp spectro‐radiometer plots a permanent record on a chart in 12.5 minutes while the cathode‐ray tube instrument performs the measurement in 48 seconds.

Calcium Halophosphate Phosphors

“…The coated bulbs were baked to remove the binder, electrodes sealed in, and the lamps exhausted on production equipment, with 20-watt lamps of the usual fluorescent type being made. The spectral energy distribution of the lamps was measured on a spectroradiometer, described in a recent paper (6), which plots automatically the relative emitted energy as a function of wavelength. The color parameters of the phosphor emission were computed for the I.C.I.…”

Fluorometric Analysis

“…Recording spectroradiometers have been developed by Parsons and his associates (123) for the automatic recording of the energy distributions emitted by luminescent materials. The fluorescent spectra of dyestuffs on cloth have been obtained with modifications of the Carey (109) and Beckman (143) spectrophotometers.…”

Review of Articles on Luminescence for 1950

“…Recording spectrophotometers designed for measuring the emission of phosphors and of luminescent devices have been described by Studer and Jacobson (44) and by Parsons, Martin, and Roberto (45).…”