Published 2000 | Version v1
Report Open

Concentration quenching of the emission of F+3 and F2 color centers in LiF

Creators

  • 1. ENEA, Divisione Fisica Applicata, Centro Ricerche Frascati, Frascati, RM (Italy)

Description

The emission efficiency of F+3 and F2 centers as a function of their concentration has been investigated in LiF crystals colored at RT with 3 MeV electrons. From a careful investigation of their absorption and emission spectra from 80 K to RT, it was discovered that the emission efficiency h of both F+3 and F2 defects is constant up to ∼ 1016 centers/cm3. When increasing the concentration up to 1018 centers/cm3, h is decreasing slightly for the F2 centers and considerably for the F+3 ones. Moreover, the efficiency of the latter centers further decreases by increasing the temperature. A thermally activated process is taking place, while the F2 and other aggregate defects play an important role

Availability note (English)

Available from INIS in electronic form

Abstract (Italian)

Si e' qui presa in esame l'efficienza quantica di emissione dei centri F+3 e F2 in funzione della loro concentrazione in cristalli di LiF colorati con elettroni da 3 MeV. Dall'analisi degli assorbimenti e delle luminescenze di tali centri, da 80 K a RT, si e' ricavato che la loro efficienza h e' costante fino a concentrazioni di ∼ 1016 centri/cm3, mentre oltre i 1016 centri/cm3 h decresce, leggermente per i centri F2 e sensibilmente per gli F+3. Inoltre, l'efficienza di questi ultimi difetti decresce ulteriormente all'aumentare della temperatura. Si suppone l'esistenza di un processo attivato termicamente, mentre i centri F2 ed altri difetti aggregati svolgono un ruolo importante

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Additional details

Publishing Information

Imprint Pagination
20 p.
ISSN
1120-5571
Report number
ENEA-RT-INN--00-30

INIS

Country of Publication
Italy
Country of Input or Organization
Italy
INIS RN
32033922
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; S71: CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS;
Descriptors DEI
COLOR CENTERS; EFFICIENCY; ELECTRON EMISSION; LITHIUM FLUORIDES; PHOTOLUMINESCENCE; TEMPERATURE DEPENDENCE
Descriptors DEC
ALKALI METAL COMPOUNDS; CRYSTAL DEFECTS; CRYSTAL STRUCTURE; EMISSION; FLUORIDES; FLUORINE COMPOUNDS; HALIDES; HALOGEN COMPOUNDS; LITHIUM COMPOUNDS; LITHIUM HALIDES; LUMINESCENCE; PHOTON EMISSION; POINT DEFECTS; VACANCIES