Light strips for lighting and backlighting applications
First Claim
1. An electronic device with a lighted keypad, the device comprising a keypad having at least one key, the at least one key incorporating a light strip comprising:
- (a) a first substantially transparent electrode layer;
(b) a second electrode layer;
(c) a plurality of electroluminescent nanoparticles consisting of quantum confined, crystalline silicon nanocrystals surface treated with an organic or inorganic passivating agent which prevents degradation of the nanoparticles caused by oxygen, said nanoparticles being disposed between the first substantially transparent electrode layer and the second electrode layer,wherein the device further comprises a display lit by the light strip, the light strip providing a single light strip to illuminate both the display and the keypad, and wherein the display is illuminated with light of a higher intensity or light of a different color than the keypad, and wherein the light strip operates without an inverter by switching between an alternating current and direct current voltage source.
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Accused Products
Abstract
Light strips for emergency lighting, path lighting, accent lighting and device lighting are provided. Devices incorporating and lighted by the light strips are also provided. The light strips include a light emitting layer made from a plurality of semiconductor nanoparticles disposed between and in electrical communication with an anode and a cathode. The semiconductor nanoparticles may be made from Group IV semiconductors, such as silicon. Devices that may be lit with the light strips include displays and keypad, such as those found in cellular phones and personal digital assistants.
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Citations
15 Claims
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1. An electronic device with a lighted keypad, the device comprising a keypad having at least one key, the at least one key incorporating a light strip comprising:
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(a) a first substantially transparent electrode layer; (b) a second electrode layer; (c) a plurality of electroluminescent nanoparticles consisting of quantum confined, crystalline silicon nanocrystals surface treated with an organic or inorganic passivating agent which prevents degradation of the nanoparticles caused by oxygen, said nanoparticles being disposed between the first substantially transparent electrode layer and the second electrode layer, wherein the device further comprises a display lit by the light strip, the light strip providing a single light strip to illuminate both the display and the keypad, and wherein the display is illuminated with light of a higher intensity or light of a different color than the keypad, and wherein the light strip operates without an inverter by switching between an alternating current and direct current voltage source. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A light strip comprising:
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(a) a first substantially transparent electrode layer; (b) a second electrode layer; and (c) a light emitting layer comprising a plurality of electroluminescent nanoparticles consisting of quantum confined crystalline silicon nanocrystals surface treated with an organic or inorganic passivating agent which prevents degradation caused by oxygen, said nanoparticles being disposed between the first substantially transparent electrode layer and the second electrode layer; wherein the light emitting layer comprises nanoparticle density domains along the length of the light emitting layer and the density domains are separated such that a defect in one domain does not affect the remaining domains, further wherein at least two domains have different densities of nanoparticles, and further wherein the light strip operates without an inverter by switching between an alternating current and direct current voltage source. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification