UV/blue led-phosphor device with efficient conversion of UV/blues light to visible light
First Claim
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1. A visible light emitting device comprising:
- a supporting body having an upper surface with a depression having an opening in the upper surface;
a UV and blue and visible light-reflecting layer on the surface of the depression;
a UV and blue light emitting diode (UV and blue LED) centrally located on the light reflecting layer;
the LED having an active region with a first index of refraction;
particles of a visible light emitting phosphor surrounding the sides and top of the LED; and
a UV and blue and visible light transmitting material surrounding the LED and filling the depression, the UV and blue and visible light transmitting material having a second index of refraction lower than the said first index of refraction.
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Abstract
A light emitting device for use in lighting and/or display applications includes a UV/blue LED located in a depression having reflecting sidewalls, a light transmitting material surrounding the LED and filling the depression, and a phosphor in the form of particles either dispersed in the light transmitting material or adhered to the surface of the LED. The sidewalls reflect UV as well as visible light, thus enhancing the efficiency of the device. Optical filters located on the top of the LED and/or the bottom of a UV absorbing glass plate covering the depression further enhance efficiency and/or spectral characteristics of the emitted light.
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Citations
16 Claims
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1. A visible light emitting device comprising:
- a supporting body having an upper surface with a depression having an opening in the upper surface;
a UV and blue and visible light-reflecting layer on the surface of the depression;
a UV and blue light emitting diode (UV and blue LED) centrally located on the light reflecting layer;
the LED having an active region with a first index of refraction;
particles of a visible light emitting phosphor surrounding the sides and top of the LED; and
a UV and blue and visible light transmitting material surrounding the LED and filling the depression, the UV and blue and visible light transmitting material having a second index of refraction lower than the said first index of refraction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- a supporting body having an upper surface with a depression having an opening in the upper surface;
Specification