Magnesium oxide-containing barrier layer for thick...

H - Electricity – 05 – B

Patent

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Details

H05B 33/12 (2006.01) H01L 49/02 (2006.01) H05B 33/10 (2006.01) H05B 33/14 (2006.01) H05B 33/22 (2006.01) H01L 33/00 (2006.01)

Patent

CA 2603626

A novel laminate is provided to improve the operating stability of thioaluminate based phosphors used in ac thick film dielectric electroluminescent displays. The novel structure comprises a rare earth activated alkaline earth thioaluminate phosphor thin film layer and a magnesium oxide or magnesium oxide containing layer provided directly adjacent and in contact with the bottom of the phosphor thin film layer. The invention is particularly applicable to phosphors used in electroluminescent displays that employ thick dielectric layers subject to high processing temperatures to form and activate the phosphor films.

L'invention porte sur un nouveau stratifié destiné à améliorer la stabilité de fonctionnement de phosphores à base de thioaluminate et utilisé par les affichages électroluminescents à diélectrique en film mince, à courant alternatif. La nouvelle structure comprend une couche en film mince de phosphore à base de thioaluminate de terre alcaline activée par une terre rare et une couche contenant un oxyde de magnésium placée directement adjacente et en contact avec le fond de la couche en film mince de phosphore. L'invention peut notamment s'appliquer à des phosphores utilisés dans des affichages électroluminescents qui utilisent des couches de diélectrique épaisses, soumises à des températures de traitement élevées de façon à former et à activer les films de phosphore.

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