Optical Semiconductor Device with Dual Fluorescent Layers
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Solution Overview
Problem
Optical semiconductor devices with semiconductor light-emitting elements and fluorescent materials face inefficiencies in light emission due to absorption and reflection issues, leading to unbalanced brightness and potential deterioration of the device's container.
Innovation Solution
The device incorporates a container with a depression to reflect light, featuring a first fluorescent material layer excited by the semiconductor light-emitting element to emit yellow light and a second fluorescent material layer, with portions on the bottom and side surfaces, excited by the emitted light to produce red light, reducing light loss and preventing container deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the second fluorescent material layer is excited by both direct light from the semiconductor light-emitting element and reflected light from the first fluorescent material, then the second fluorescent material layer can emit light, but the overall light emission efficiency is reduced due to reflection losses
Solution Approach 1:
The patent introduces the first fluorescent material layer as an intermediary between the semiconductor light-emitting element and the second fluorescent material layer. This intermediary layer selectively absorbs and re-emits light, allowing the second fluorescent material layer to be excited by transmitted light rather than suffering from reflection losses, thus improving overall light emission efficiency.
2Illumination intensity
If yellow light is emitted from the side surface of the semiconductor light-emitting element, then the yellow light can be emitted, but the container may be discolored and deteriorated by the yellow light
Solution Approach 1:
The patent converts the potentially harmful yellow light that would otherwise cause container discoloration and deterioration into a beneficial element by using it to excite the fluorescent material layers. The fluorescent materials absorb and re-emmit the light in a controlled manner, preventing direct exposure of the container to degrading yellow light while still achieving the desired yellow light emission effect.
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 enhances the brightness of the white-grouped mixed light and prevents container discoloration and deterioration by optimizing light emission and absorption, ensuring efficient and balanced luminescence.
Implementation Method 1
a semiconductor light-emitting element placed in the depression to emit light
Implementation Method 2
the first fluorescent material layer being excited by the light emitted from the semiconductor light-emitting element to emit light having a first wavelength
Implementation Method 3
a container having a depression to reflect light, the depression having an opening
Data Source
AI summary
A semiconductor light-emitting element is disposed in a depression of a container. A first fluorescent material layer is located in the depression. At least a portion of the first fluorescent material layer is provided between the opening of the depression and the semiconductor light-emitting element. A second fluorescent material layer having first and second portions is disposed in the depression. The first portion is provided between the bottom of the depression and the semiconductor light-emitting element. The second portion is provided between the side surface of the depression and the semiconductor light-emitting element. The first and second fluorescent material layers are excited by the light radiated from the semiconductor light-emitting element to emit a light having a first wavelength longer than the emission wavelength of the semiconductor light-emitting element and another light having a second wavelength longer than the first wavelength respectively.