Accession Number:

AD0499816

Title:

Trapping in Solids.

Descriptive Note:

Interim rept. no. 2, 12 May-8 Oct 48,

Corporate Author:

RCA LABS PRINCETON NJ

Personal Author(s):

• Bube, R. H.
• Lasof, S.
• Leverenz, H. W.

Report Date:

1948-10-15

Pagination or Media Count:

38.0

Abstract:

Phosphors with an exponential decay may be differentiated from those with a power-law decay by the presence of low-lying highly localized impurity-introduced levels, such that no local or remote trapping is encountered either upon excitation or return. Such highly localized levels are absent for power-law decay phosphors and either 1 semi-localized high-lying levels give rise to trapping in the vicinity of the center, or 2 entrance of the excited electron into the conduction band gives rise to trapping at some distance from the parent center. The temperature dependence of efficiency and decay is the result of competition between a luminescence-producing and a dissipative transition. The behavior of traps under these circumstances can be seen simultaneously from related variations in efficiency and decay for four phosphors observed. Author

Descriptors:

• *FLUORESCENT SCREENS
• *CATHODE RAY TUBE SCREENS
• IMPURITIES
• EXCITATION
• ELECTRONS
• LUMINESCENCE
• PHOSPHORESCENCE
• EFFICIENCY
• TEMPERATURE
• DENSITY
• POWER SPECTRA
• INTENSITY
• CHARGE CARRIERS
• ATOMIC ENERGY LEVELS

Subject Categories:

• Electrooptical and Optoelectronic Devices
• Miscellaneous Materials
• Atomic and Molecular Physics and Spectroscopy
• Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE