Room Temperature Investigation of the Photostimulated Afterglow in KCl:Eu²⁺ Crystals

Abstract

. KARAMIRHAILOVA (a), M. MLADENOVA (a), and X. GEORGIEV (b) KCI : Eu?', y-irradiated a t room temperature, is known to luminesce on photoexcitation in the F band with the emission spectrum of the impurity ion. Several experiments are made now: firstly, the emission-excitation spectrum is found to exhibit a peak a t about 600 nm. Secondly, the samples are excited with the SH of a mode-locked Nd glass laser. The maximum emission response occurs delayed a t about 400 ns relative to the laser-pulse peak. The luminescent quantum yield is estimated to b e about 1%. The decay kinetics of the phosphorescent tail is also followed. , 4 tentative model is discussed in which the luminescence results from a two-step electron tunneling between excited F and E u levels. KC1 : Eu2+, bei Zimmertemperatur y-bestrahlt, luminesziert nach Photoanregung in der F-Bande mit dem Emissionsspektrum des Aktivatorions. Einige Experimente werden durchgefiihrt : erstens wird gefunden, daB das Emissionsanregungsspektrum ein Maximum bei etwa 600 nm besitzt ; zweitens werden die Kristalle mit der zweiten Harmonischen eines ,mode-locked' Nd-Glaslasers angeregt. Es wird gefunden, daB die maximale Emission mit etwa 400 ns im Vergleich Z U dem Laserpulsmaximum verzogert wird. Es wird abgeschatzt. daB die Lumineszenzquantenausbeute etwa 194 betragt. Die Abkling-Kinetik der Phosphoreszenz wird ebenfalls gemessen. Ein wahrscheinliches Modell wird diskutiert.

Cathodoluminescence and Optically Active Regions of Intrinsic and Induced Defects in Eu2+-Doped KCl Crystals

“…In the case of doped samples, no CL studies have been performed until now, at least to our best knowledge, but several investigations by using different techniques and irradiation sources have been done to know the origin and processes involved in the luminescence of irradiated samples [17,18]. The TL of room temperature (RT) b-rays and UV irradiated samples revealed the typical europium ion emission band and two shoulders located at both sides of the main emission.…”

Dosimetric properties and radiation hardness of the storage phosphor europium doped potassium chloride for radiation therapy dosimetry

“…A band model for PSL in KCl:Eu 2+ can now be generated (figure 2.6; after [56] and [64], cf. [65]). From the radiation therapy physicist user's perspective, this model is important for several reasons.…”