White light emitting diode

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 11/59 (2006.01)

Patent

CA 2560470

The inventive white-light emitting diode is characterised in that it comprises a source emitting radiation whose wavelength band ranges from 370 to 420 nm, a first blue and red-light emitting phosphor of formula Ba3(1-x)Eu3xMg1-yMnySi2O8 (1), wherein 0 < x 0,3 and 0 < y 0,3 and a second green-light emitting phosphor. In another embodiment, said diode comprises the same source and a single phosphor whose chemical composition is Ba3(1-x)Eu3xMg1-yMnySi2O8, wherein 0 < x 0,3 et 0 < y 0,3 and which is embodied in the form of a mixture of at least Ba2SiO4, Ba2MgSi2O7 and Ba3MgSi2O8 phases. The inventive diode can be used for a lighting device.

La diode électroluminescente de l'invention émet une lumière blanche et est caractérisée en ce qu'elle comprend une source d'émission d'une radiation dans la gamme de longueur d'onde comprise entre 370 nm et 420 nm; un premier luminophore émettant une lumière bleue et une lumière rouge, de formule Ba3(1- x)Eu3xMg1-yMnySi2O8 (1) dans laquelle 0 < x 0,3 et 0 < y 0,3; et un second luminophore émettant une lumière verte. Selon un autre mode de réalisation, la diode comprend la même source précitée et un seul luminophore de composition chimique Ba3(1-x)Eu3xMg1-yMnySi2O8 avec 0 < x 0,3 et 0 < y 0,3, mais qui se présente sous la forme d'un mélange d'au moins des phases Ba2SiO4, Ba2MgSi2O7 et Ba3MgSi2O8. La diode de l'invention peut être utilisée dans un dispositif d'éclairage.

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