Oxygen substituted barium thioaluminate phosphor materials

Details Oxygen substituted barium thioaluminate phosphor materials Oxygen substituted barium thioaluminate phosphor materials

H - Electricity

05

B

H05B 33/14 (2006.01) C09K 11/56 (2006.01) C09K 11/77 (2006.01) H05B 33/10 (2006.01) H05B 33/12 (2006.01) H05B 33/22 (2006.01) H05B 33/26 (2006.01)

Patent

CA 2482833

A thin film phosphor for an electroluminescent device, the phosphor being selected from the group consisting of thioaluminates, thiogallates and thioindates having at least one cation selected from elements of Groups IIA and IIB of the Periodic Table of Elements. The phosphor being activated by a rare earth metal and containing oxygen as a partial substitute for a portion of the sulphur in the crystal lattice of the thiogallate, thioindate or thioaluminate. The phosphor is a single phase homogeneous compound and provides improved luminance stability. An electroluminescent device comprising the thin film phosphor is also described and methods of making the phosphor of the invention.

L'invention concerne un phosphore en couche mince destiné à un dispositif électroluminescent, ce phosphore étant choisi dans le groupe constitué par des thioaluminates, des thiogallates et des thioindates comprenant au moins un cation choisi parmi les éléments des groupes IIA et IIB du tableau périodique des éléments. Le phosphore est activé au moyen d'un métal des terres rares et contient de l'oxygène comme substitut partiel pour une partie du soufre se trouvant dans le réseau cristallin du thiogallate, du thioindate ou du thioaluminate. Ce phosphore est un composé homogène monophasé et confère une stabilité de luminance améliorée. L'invention concerne également un dispositif électroluminescent comprenant ce phosphore en couche mince ainsi que des procédés de production du phosphore de l'invention.

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