Semiconductor Light Emitting Device with Localized Fluorescent Coating
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Solution Overview
Problem
Semiconductor light emitting devices with chip-size package structures, combining LEDs and fluorescent substances, face challenges in achieving uniform optical properties such as brightness distribution.
Innovation Solution
The device includes a laminate structure with n-type and p-type semiconductor layers, a light emitting layer, a resin layer that covers the outer edges, and insulating films to guide and reflect light, enhancing light transmission and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a chip-size package structure combining LEDs and fluorescent substances is used, then the device can emit visible light such as white light, but the brightness distribution becomes non-uniform
Solution Approach 1:
The patent applies local quality by positioning fluorescent substances at specific locations around the LED chip rather than uniformly distributing them. The side surfaces of the semiconductor substrate are coated with fluorescent materials at defined positions, creating localized light conversion zones that collectively produce more uniform overall brightness distribution.
Solution Approach 2:
The patent utilizes the vertical dimension by coating fluorescent substances on the side surfaces of the semiconductor substrate. This three-dimensional arrangement allows light to be converted and emitted from multiple spatial locations (top surface and side surfaces), improving brightness uniformity across the emitting area.
2Illumination intensity
If fluorescent substances are added to modify the light spectrum, then visible light such as white light can be emitted, but the optical properties such as brightness distribution require improvement
Solution Approach 1:
Different fluorescent substances with specific emission characteristics are positioned at different locations on the semiconductor substrate. This localized placement allows precise control over the spectral composition and intensity distribution, achieving both desired color temperature and uniform brightness.
Solution Approach 2:
The patent employs composite fluorescent material systems combining multiple fluorescent substances with different emission wavelengths. These composite fluorescent layers are applied to the side surfaces, creating a multi-wavelength light conversion system that achieves superior optical uniformity and color quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves light intensity and uniformity at the emitting surface, addressing the issue of non-uniform brightness distribution by efficiently guiding emitted light and using fluorescent substances to modify the light spectrum.
Implementation Method 1
a light emitting layer between, in a first direction, the first and second layers
Implementation Method 2
a first insulating film that contacts the first surface in the outer portion and has a wall surface extending in the first direction from the first surface at a position that is in the outer portion and spaced in the second direction from the outer edge
Implementation Method 3
combinations of light emitting diodes (LEDs) and fluorescent substances
Data Source
AI summary
A light emitting device includes a first layer of a first conductivity type, a second layer of a second conductivity type, and a light emitting layer between the first and second layers. A resin layer is disposed on a first surface of the first layer. The first layer has an outer portion that extends beyond the second and light emitting layers to an outer edge. A first electrode contacts the first layer in the outer portion on a second surface opposite the first surface; and a second electrode contacts the second layer. A first insulating material contacts the first surface in the outer portion of the first layer and has a wall surface extending from the first surface at a position that is in the outer portion and spaced from the outer edge.