Year: 1965
Type: article
Abstract: Terbium-activated alkaline-earth borates, excited with short-wavelength ultra-violet radiation, show luminescence with an emission spectrum characteristic of the terbium. Most phosphors have a relatively high brightness at elevated temperatures. The efficiencies have been measured with excitation in the 250-270 nm region. Quantum efficiencies of more than 40% were obtained with excitation in the 250-270'nm region. The excitation spectra of the terbium emission, i.e. the totallight output ofthe terbium fluorescence as a function of the exciting wavelength, show a broad excitation band with a peak at about 240 nm. Phosphors activated with terbium and gadolinium have excitation spectra with sharp Tb-emission peaks at exciting wavelengths which coincide with absorption lines due to Gd ions. This is explained as a transfer of energy absorbed by the Gd ions to the Tb activator ions. The decay times of the phosphors are found to lie between ]'9 and 2·6milliseconds. Hitherto unpublished X-ray-diffraction patterns of the compounds 3SrO.B20a, 2SrO.B20a and SrO.2B20a are given.
DOI: 10.1149/1.2423383
Authors: W. L. Wanmaker, A. Bril, J. W. ter Vrugt
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W1995623144