Luminous element

Abstract

A kind of high-output-efficiency light emitting component includes a first substrate, a LED chip set on the first substrate, fluorescent material set on the said LED chip, a photonic crystal set above the said fluorescent material and a reflector which is set above the said photonic crystal and can reflect lights to the said fluorescent material. The said first substrate can be a metal cup; the said LED chip is set at bottom of the metal cup; the said photonic crystal includes a second substrate and even numbers of protrusions set on the second substrate; the said protrusion includes a bottom set on the second substrate and a tip of which the size is smaller than it of the said bottom; the said even numbers of protrusions can be triangle cylinder, half-circular cylinder, string-wave cylinder, pyramid or cone.

Description

technical field [0001] The invention relates to a light-emitting element, in particular to a light-emitting element with a concave-convex structure photonic crystal and a reflection plate. Background technique [0002] FIG. 1 illustrates a conventional light emitting device 10 . The light-emitting element 10 includes a substrate 12, a light-emitting diode chip 14 disposed on the substrate 12, a fluorescent substance (refractive index of about 1.5-1.6) 16 disposed on the light-emitting diode chip 14, and A transparent cover (refractive index about 1.5) 18 . The light 20 (such as ultraviolet light) can excite the fluorescent substance (such as red, green and blue fluorescent substance) 16 to generate red, green and blue excitation light 22 , and the red, green and blue excitation light 22 is mixed to form white light 24 . The light 20 generated by the LED chip 14 must pass through the fluorescent substance 16 and the transparent cover 18 , and then propagate to the outside o...

AI Technical Summary

Problems solved by technology

In short, most of the excitation light 22 is seriously lost due to reflection or absorption inside the lig

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