RADIATIONLESS TRANSITIONS IN THE LUMINESCENCE CENTERS OF ALKALI HALIDE PHOSPHORS

Journal Article · Fri Jan 01 04:00:00 EST 1960 · Trudy Inst. Fiz. i Astron., Akad. Nauk Eston. S.S.R.

OSTI ID:4061629

Schwarts, K K; Vale, G K; Zunde, B Ya

Experimental results are compared with theoretical ideas concerning radiationless transitions in alkali halide phosphors of NaCl, KCl, and KBr, activated by the ions In/sup +/, Sn/sup 2//sup +/, Tl/sup +/, Pb/sup 2//sup +/. There are three possible mechnnis ms of radiationless transitions: thermally activated, optically activated, and tunnel. Experiments reveal only thermally activated radiationless transitions in the case of alkali halide phosphors activated by mercury-like ions. Such transitions cause the well-known thermal quencning of luminescence. Detailed investigation of thermally activated radiationless transitions showed that they conform with the quasi-molecular model of an impurity center: radiationless transitions occur after the establishment of equilibrium between an excited center and the crystalline lattice at . vibration levels; radiationless transitions take place across the activating barrier and depend exponentially upon l/T, where T is temperature. (auth)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-15-020015
• OSTI ID: 4061629
• 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. 12
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

ALKALI METALS
BARRIERS
ENERGY LEVELS
EXCITATION
HALIDES
IMPURITIES
INDIUM
IONS
LATTICES
LEAD
LUMINESCENCE
MERCURY
PHOSPHORS
PHYSICS
POTASSIUM BROMIDES
POTASSIUM CHLORIDES
QUENCHING
RADIATIONS
SODIUM CHLORIDES
TEMPERATURE
THALLIUM
THERMAL RADIATION
THERMODYNAMICS
TIN
TRANSIENTS
VIBRATIONS