Thin film electroluminescent device
First Claim
1. A thin film EL device comprising a substrate of a transparent electrical insulator, a first electrode formed on said substrate, an EL layer formed on said first electrode through a transparent first insulating layer interposed therebetween, a transparent second insulating layer enclosing the exposed part of said EL layer, and a second electrode formed on said second insulating layer, wherein at least one of said first and second electrodes is transparent, said EL layer contains, as its host material, strontium sulfide whose crystals strongly tend to have a (200) orientation, and the ratio of the X-ray diffraction intensity I(200)/I(111) is not smaller than three.
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Abstract
A thin film electroluminescent (EL) device comprises a pair of opposing electrodes formed on a substrate of a transparent electrical insulator, and an EL layer formed between the electrodes and covered at both surfaces with insulating layers respectively. Strontium sulfide is used as a host material of the EL layer, and its crystals tend strongly to have a (200) orientation, so that the resistance to free transit of electrons participating in emission of luminescence is substantially eliminated to ensure a higher brightness.
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Citations
12 Claims
- 1. A thin film EL device comprising a substrate of a transparent electrical insulator, a first electrode formed on said substrate, an EL layer formed on said first electrode through a transparent first insulating layer interposed therebetween, a transparent second insulating layer enclosing the exposed part of said EL layer, and a second electrode formed on said second insulating layer, wherein at least one of said first and second electrodes is transparent, said EL layer contains, as its host material, strontium sulfide whose crystals strongly tend to have a (200) orientation, and the ratio of the X-ray diffraction intensity I(200)/I(111) is not smaller than three.
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11. A thin film electroluminescent device having high brightness of luminescence comprising;
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a substrate made of a transparent electrical insulator; a first electrode formed on said substrate; a transparent first insulating layer formed on said first electrode; an electroluminescent layer formed over said transparent first insulating layer, said electroluminescent layer comprising, as its host material, a layer of strontium sulfide having a (200) orientation stronger than the (200) orientation of strontium sulfide in a powder form; a transparent second insulating layer formed over and enclosing said electroluminescent layer; and
a second electrode formed on said transparent second insulating layer, wherein at least one of said first and second electrodes is transparent. - View Dependent Claims (12)
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Specification