INFLUENCE OF HIGH PRESSURE ON THE EMISSION AND EXCITATION SPECTRA OF ALKALI HALIDE PHOSPHORS

Journal Article · Thu Jan 01 04:00:00 EST 1959 · Trudy Inst. Fiz. i Astron. Akad. Nauk Eston. S.S.R.

OSTI ID:4206093

Kirs, Ya Ya; Laisaar, A J

The investigation deals with the influence of hydrostatic pressure (up to 6000 kg/cm/sup 2/) on the emission spectra of the phosphors HCl(Tl), KBr(Tl), NaCl(In), KCl(In), KBr(In), KI(In), KCl(Sn), and KCl(Pb) and on the excitation spectra of the phosphors KCl(In), KCl(Sn), and KCl(Pb). Increase in pressure leads to the shifting of the emission bands towards a shorter wavelength. The relative intensity of the shortwave band increases in the phosphors having two emission bands. The excitation bands ane shifted under the influence of pressure towards a longer wavelength. Shifts in the emission spectra are probably directly connected with a change in the energy of electronic transitions in the centers of luminescence. From the point of view of the thermodynamic theory decrease in the energy of these transitions under the pressure means that in the excited state of the luminescence center the equillbrium separation between the activator ion and its immediate envirorment is smaller than in the grourd state. To explain the changes in the emission spectrn one has to assume that the activator ions have two excitation levels, the energy gap between which is small. (auth)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-14-006808
• OSTI ID: 4206093
• Journal Information: Trudy Inst. Fiz. i Astron. Akad. Nauk Eston. S.S.R., Journal Name: Trudy Inst. Fiz. i Astron. Akad. Nauk Eston. S.S.R. Vol. Vol: No. 10
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

ALKALI METALS
CRYSTALS
ELECTRONS
EMISSION
ENERGY
ENERGY LEVELS
ENVIRONMENT
EXCITATION
FREQUENCY
HALIDES
INDIUM
IONS
LEAD
LUMINESCENCE
MEASURED VALUES
PHOSPHORS
PHYSICS
POTASSIUM BROMIDES
POTASSIUM CHLORIDES
POTASSIUM IODIDES
PRESSURE
SODIUM CHLORIDES
SPECTRA
SPECTRAL SHIFT
THALLIUM
THERMODYNAMICS
TIN