The Luminescence Properties of Alkaline‐Earth Oxides Activated with 6s² Ions

Abstract

The luminescence spectra of CaO and SrO activated with Pb2+ or Bi3+ ions show vibrational structure. The features in the spectra are discussed by considering the PbOiO-(BiOp) octahedron as an isolated unit in the rocksalt lattice. The luminescence spectra of TI+-activated CaO and SrO do not show vibrational structure. Comparisons are made with other s2 ion-activated systems.Die Lumineszenzspektren von CaO und SrO aktiviert mit Pb2+ -oder BP+-Ionen zeigen Vibrationsstrukturen. Die Strukturen in den Spektren werden unter der Annahme diskutiert, daB man die PbOiO-(BiOi-) Oktaeder wie eine isolierte Einheit im Steinsalzgitter betrachtet. Die Lumineszenzspektren von Tl+-aktiviertem CaO und SrO zeigen keine Vibrationsstrukturen. Ein Vergleich mit anderen s2-Ionen-aktivierten Systemen wird durchgefuhrt.

The luminescence of some oxidic bismuth and lead compounds

“…A few examples of temperature-dependent lifetime measurements on lead centers are cited in the literature. For lead centres in cubic CaO and SrO a trap depth of about 100 meV was observed (34). On the other hand, CaZr03-Pb2+ has a trap depth of about 10 meV (35).…”

Luminescence of Pb2+ in Some Aluminates Prepared by Combustion Synthesis

“…PL characteristics were studied using a Hitachi F-4000 spectrofluorometer, at room temperature. Figure 1 shows PL spectra for SrAl 12 [34]. Eu 2 emission in these phosphors was observed at the positions mentioned in the literature.…”

“…It will be useful to search for other hosts. Pb 2 emission has been studied in borates [4 to 8], haloborates [6], phosphates [9], sulphates [10], carbonates [11], oxides [12,13], halides [14 to 16], oxyhalides [17], etc. In serveral of these hosts, Pb 2 emission is quenched at quite low temperatures [9,14,18].…”

On the Luminescence of Some s2‐Ion‐Activated Alkaline‐Earth Phosphates

“…in the emission spectrum of CaO:Bi3+ [5]. The small Stokes shift suggests that concentration quenching may be responsible for the low quenching temperatures.…”

“…The trap depth AE of the Bi3+ ion in several oxidic host lattices has been determined by Boulon et al from the temperature dependence of the decay time of the emission 141. Vibrational structure is sometimes observed in the luminescence spectra of Pb2+-or Bi3+-activated compounds [5]. Due to the Jahn-Teller interaction, the emission from the 3P excited state can consist of two bands (AT and A,) […”