Lighting device including multiple wavelength conversion material layers

摘要

A lighting device includes an electrically activated emitter, a first layer that contains a first lumiphoric material, and a second layer that contains a second lumiphoric material, with a textured interface between the first layer and the second layer. Additional lumiphoric material layers, spacer layers, and/or encapsulant layers may be provided. Multiple textured interfaces may be provided. Textured interfaces may be arranged as lenses, including Fresnel lenses.

主权项

1. A lighting device comprising:
at least one electrically activated emitter; a first layer comprising at least one first lumiphoric material overlying at least a portion of the at least one electrically activated emitter and arranged to be stimulated by emissions of the at least one electrically activated emitter; and a second layer comprising at least one second lumiphoric material overlying at least a portion of the first layer and arranged to be stimulated by emissions of the at least one electrically activated emitter; wherein an interface between the first layer and the second layer is textured, and the textured interface comprises at least one of the following textural features (i) and (ii):
(i) at least one outwardly protruding portion of the first layer that includes at least one protruding portion lateral wall of the first layer arranged in contact with the second layer, wherein the at least one protruding portion of the first layer comprises a height of at least 5 micrometers; and(ii) at least one recess defined in the first layer that is bounded by at least one recess lateral wall of the first layer arranged in contact with the second layer, wherein the at least one recess defined in the first layer comprises a depth of at least 5 micrometers; and wherein the textural features comprise at least one of the following cross-sectional conformations: sawtooth, interrupted sawtooth, truncated sawtooth, square wave, interrupted square wave, square-shaped, rectangular, trapezoidal, triangular, and truncated triangular.