Light-emitting thin film and thin film EL device
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMichio Okajima, Takao Tohda
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Abstract
A phosphor thin film of a compound of zinc, cadmium, manganese or alkaline earth metals and an element of group VI is sandwiched by barrier layers having a larger energy gap than that of the phosphor thin film, and a plurality of the sandwich structures are accumulated thicknesswise to constitute a light-emitting device. The phosphor thin film ensures the confinement of injected electrons and holes within the phosphor thin film. The light-emitting device has a high brightness and a high efficiency.
Claims15
A light emission film having a multi-layer structure, comprising:
- at least one phosphor film sandwich, each at least one phosphor film sandwich including a phosphor film and first and second barrier layers, said first and second barrier layers being separated by and in contact with said phosphor film,
- wherein the thickness of said phosphor film is less than 50 nm and larger than 1 nm, and the energy gap of said barrier layers is larger than that of said phosphor film to thereby confine carriers within said phosphor film.
A light emission film having a multi-layer structure, comprising:
- at least one phosphor film sandwich, each at least one phosphor film sandwich including a phosphor film and first and second barrier layers, said first and second barrier layers being separated by and in contact with said phosphor film,
- wherein the thickness of said phosphor film is less than 50 nm and larger than 1 nm, and the energy gap of said barrier layers is larger than that of said phosphor film to thereby confine carriers within said phosphor film, and said phosphor film contains at least one chemical compound selected from the group consisting of chemical compounds of zinc, cadmium, manganese and alkaline earth metals together with elements from group VI.
Dependencies are inferred from the claim text.