Processing of end-of-life CRT glass and its potential as dielectric in AC-electroluminescence

Hubert Schulze Dieckhoff ,  Yong Gao ,  Michael Bredol 

Fachhochschule Münster, Stegerwaldstraße 39, Steinfurt 48565, Germany


The reuse of waste materials in high quality applications is of high economic and ecologic importance. Glassy materials from end-of-life cathode ray tubes (CRT) in this context come in several fractions: panel or screen glass (ca. 2/3 by weight, major content of BaO and SrO), funnel glass (ca. 1/3 by weight, up to 25% PbO), neck glass (up to 40% PbO) and solder glass (up to 85% PbO). The PbO-containing fractions can be processed to metallic Pb, while for screen glass there is no further use at present. Therefore, preprocessing of this fraction (to get rid of the heavy metal content) and its potential use in dielectric binders (e.g. for AC-electroluminescence) are reported in this work.

Preprocessing of the milled glass fraction proceeds at elevated temperature in moist atmosphere and reduces the Ba- and Sr-content in the surface layer of the powder particles. The final activated glass powder is formulated with polymeric binders and sintering aids on borate base to a printable paste. Commercial AC-electroluminescent ZnS powder was worked into this paste, and finally small AC-electroluminescent units were fabricated from this multifunctional composite by tape-casting on ITO glass and application of carbon back electrodes. Morphological as well as optical data of these structures are reported. Future work will concentrate on improvements in homogeneity, area, emission intensity and durability. Since the binder is of inorganic nature, high temperature resistant structures on glass will be fabricated as well.

The results thus show, that a problematic waste material may be transformed into a multifunctional material of high economic value by comparable simple processing.

Legal notice
  • Legal notice:

    Copyright (c) Pielaszek Research, all rights reserved.
    The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
    In every case, proper references including Author(s) name(s) and URL of this webpage: must be provided.


Related papers
  1. ZnS/carbon nanocomposites for electrocatalytic application
  2. Luminescent nano-sized ZnS and ZnO particles

Presentation: Oral at E-MRS Fall Meeting 2009, Symposium I, by Hubert Schulze Dieckhoff
See On-line Journal of E-MRS Fall Meeting 2009

Submitted: 2009-05-08 10:08
Revised:   2009-07-07 16:00
© 1998-2022 pielaszek research, all rights reserved Powered by the Conference Engine