Structure and method for LED with phosphor coating
View Patent ↗The present disclosure provides a light emitting diode (LED) apparatus. The LED apparatus includes an LED emitter having a top surface; and a phosphor feature disposed on the LED emitter. The phosphor feature includes a first phosphor film disposed on the top surface of the LED emitter and having a first dimension defined in a direction parallel to the top surface of the LED emitter; a second phosphor film disposed on the first phosphor film and having a second dimension defined in the direction; and the second dimension is substantially less than the first dimension.
1. A light-emitting apparatus, comprising:
a package substrate;
a light-emitting diode (LED) die disposed over the package substrate;
a first phosphor material disposed on a surface of the LED die, wherein a sidewall of the LED has no first phosphor material disposed thereon; and
a second phosphor material disposed directly on the first phosphor material;
wherein the second phosphor material contains a plurality of sub-features that are each shaped in a top view as a disk, a square, or a polygon.
2. A light-emitting apparatus, comprising:
a package substrate;
a light-emitting diode (LED) die disposed over the package substrate;
a first phosphor material disposed on a surface of the LED die, wherein a sidewall of the LED has no first phosphor material disposed thereon; and
a second phosphor material disposed directly on the first phosphor material;
wherein the second phosphor material contains a plurality of peaks and dips in a cross-sectional view.
3. A light-emitting apparatus, comprising:
a package substrate;
a light-emitting diode (LED) die disposed over the package substrate;
a first phosphor material disposed on a surface of the LED die, wherein a sidewall of the LED has no first phosphor material disposed thereon; and
a second phosphor material disposed directly on the first phosphor material;
wherein the second phosphor material is circumferentially surrounded by the first phosphor in a top view.
4. A light-emitting apparatus, comprising:
a light-emitting diode (LED) die;
a first phosphor material disposed on a surface of the LED die, wherein a sidewall of the LED has no first phosphor material disposed thereon; and
a second phosphor material disposed directly on the first phosphor material; wherein the first phosphor material has a first lateral dimension; and
the second phosphor material has a second lateral dimension that is less than the first lateral dimension,
wherein the first phosphor material is disposed between the second phosphor material and the LED die.
5. The light-emitting apparatus of claim 4 , wherein at least one of the first phosphor material and the second phosphor material has a non-flat surface profile.
6. The light-emitting apparatus of claim 4 , wherein the first phosphor film circumferentially surrounds the second phosphor film in a top view.
7. The light-emitting apparatus of claim 4 , wherein the first phosphor film contains a nitridosilicate doped by a rare earth element.
8. The light-emitting apparatus of claim 4 , wherein:
the first phosphor material emits yellow light under excitation; and
the second phosphor material emits red light under excitation.
9. The light-emitting apparatus of claim 4 , further comprising: a package substrate on which the LED die is disposed.
10. A light-emitting apparatus, comprising:
a package substrate;
a plurality of light-emitting diode (LED) dies that are spaced apart from one another;
a first phosphor layer disposed on an upper surface, but not on a sidewall, of each of the LED dies: and
a second phosphor layer disposed on the first phosphor layer of each of the LED dies in a manner such that the first phosphor layer is in physical contact with the second phosphor layer, wherein the second phosphor layer has a different material composition than the first phosphor layer, and wherein for each LED die, the second phosphor layer is circumferentially surrounded by the respective first phosphor layer therebelow in a top view.
11. The light-emitting apparatus of claim 10 , wherein at least one of the first phosphor layer and the second phosphor layer has a non-flat surface profile.
12. The light-emitting apparatus of claim 10 , wherein the first phosphor layer contains a nitridosilicate doped by a rare earth element.