Luminescence Properties of Rb₂ZnCl₄ and K₂ZnCl₄ Single Crystals

Abstract

First data the on X-ray-induced luminescence (RL) and thermoluminescence (TL) spectra in the range 10 to 300 K of K2ZnCI, and Rb2ZnC1, are reported. For both the materials, two main emission bands peaking a t 280 and 545 nm are observed in the RL spectra. They are proposed to be associated to intrinsic electron-hole recombination processes. The TL spectra show the most intense glow peaks near 205 K for both, K,ZnCl, and Rb2ZnC1,. The wavelength spectrum of the TL peaks essentially consists of the same bands appearing in the RL spectrum measured a t the same temperature. Therefore, the glow peaks should also have their origin in the same electronhole recombinations.Erste Werte der rontgeninduzierten Lumineszenz (RL)-und Thermolumineszenz (TL)-Spektren im Bereich 10 bis 300 K von K,ZnCI, und Rb,ZnC1, werden mitgeteilt. Fur beide Materialien werden in den RL-Spektren zwei Hauptemissionsbanden bei 280 und 545 nm beobachtet. Es aird angenomrnen, da13 sie mit intrinsischen Elektronen-Ucher-Rekombinationsprozessen verkniipft sind. Die TL-Spektren zeigen die intensivsten Glowmaxima bei etwa 205 K sowohl fur GZnCl, als auch Rb,ZnCI,. Das Wellenliingenspektrum der TL-Maxima besteht im wesentlichen &us denselben Banden, die im RL-Spektrum bei derselben Temperatur auft,reten. Deshalb sollten die Glowmaxima ihre Ursache in derselben Elektron-Loch-Rekombination hnben.

Auger-free luminescence due to interatomic p–d transition and self-trapped exciton luminescence in Rb2ZnCl4 crystals

“…These bands are supposedly related to some lattice imperfection. The 1.9 eV STE luminescence is quenched on increasing the temperature above 70 K, which is in good agreement with the observation by Martin et al [18].…”

“…Curve 1 consists of five bands peaking at 1.9, 2.8, 3.8, 4.5 and 6.3 eV. This spectrum is in good agreement with that observed under X-ray excitation by Martin et al [18], except for the 6.3 eV band. They have attributed two main bands at 1.9 and 4.5 eV to intrinsic electron-hole recombination, that is, recombination of electrons with self-trapped holes.…”

“…Therefore, the 4.5 and 6.3 eV bands are surely ascribed to radiative recombination of Cl 3p valence electrons with Zn 3d core holes, in contrast to the assignment in Ref. [18].…”

Preliminary results on the photoluminescence and optically stimulated luminescence in Cu‐doped and Ag‐doped ZnB2X4 (B = Li, Na, K: X = Cl, Br) compounds

“…Only a few papers are available on the defect studies using optical absorption, ESR, thermoluminescence and X-ray-induced luminescence. [8][9][10][11][12] In this paper, efforts have been made to study the luminescence of monovalent Cu + and Ag + ions. The optically stimulated luminescence and thermoluminescence were also studied.…”

“…The radiation effects in a few of these were reported in 1986 but not much work has been done on the study of luminescence in these materials since. Only a few papers are available on the defect studies using optical absorption, ESR, thermoluminescence and X‐ray‐induced luminescence . In this paper, efforts have been made to study the luminescence of monovalent Cu + and Ag + ions.…”