The Structure of Light Centers in Activated Zinc Sulfide Phosphors

Journal Article · Thu Jan 01 04:00:00 EST 1959 · Annalen der Physik (Leipzig)

DOI:https://doi.org/10.1002/andp.19594590103· OSTI ID:4219657

Riehl, N.; Ortmann, H.

The transformation of blue luminescent Cu centers into green luminescent centers (and the reverse transformation) was studied. It is shown that the transformation can occur at 200 deg C with easily observable velocity. The transformation leads to the standardization of a fixed equilibrium ratio, characteristic for each temperature, for the concentration of the green luminescent centers up to that of the blue luminescent centers. In the temperature range from 20 to 300 deg C the equilibrium is displaced with increasing temperature in favor of the green luminescent centers. (Reagents capable of desulfurizing the surface of the crystal work in the same direction.) Sufficiently rapid cooling back to room temperature can freeze an equilibrium characteristic for a higher temperature. The reverse transformation green - blue occurs even at room temperature with a finite observable velocity. From this and from the highest value found for the activation energy it is seen that the green - blue transformation is bound to no incorporation or exhaustion of S or Cl^2- ions. It can be treated only as a diffusion of Cu⁺ or Zn²⁺ ions in the interstices. As a model proposal for the blue luminescent Cu centers it is shown that there ia a Cu⁺ ion in the interstices in addition to a Cu⁺ ion on a lattice position.

• Research Organization: Technische Hochschule und Liebenwalde, Munich; Deutschen Akademie der Wissenschaften, Munich
• Sponsoring Organization: USDOE
• NSA Number: NSA-14-000346
• OSTI ID: 4219657
• Journal Information: Annalen der Physik (Leipzig), Journal Name: Annalen der Physik (Leipzig) Journal Issue: 1-5 Vol. 459; ISSN 0003-3804
• Country of Publication: Country unknown/Code not available
• Language: German

Related Subjects

ANIONS
CATIONS
CHEMICALS
CHLORINE
COLOR
COOLING
COPPER
CRYSTALS
DIFFUSION
ENGINEERING AND EQUIPMENT
LATTICES
LUMINESCENCE
SOLUTIONS
STANDARDS
SULFUR
SURFACES
TEMPERATURE
VARIATIONS
ZINC