LED Package Structure for Brightness and Afterglow Balance
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Solution Overview
Problem
Phosphorescent powder added to light-emitting diodes at inappropriate locations reduces maximum brightness when the power is turned on and affects the duration of light emission after power is turned off.
Innovation Solution
Optimizing the location of phosphorescent powder by separating it into two package parts within the light-emitting device, where the first part with phosphorescent powder is positioned below the reflective structure's top surface, preventing light attenuation and maximizing the ratio of phosphorescent to non-phosphorescent parts for extended emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If phosphorescent powder is added to the package structure, then the light emission duration after power is turned off is extended, but the maximum brightness when power is turned on is reduced
Solution Approach 1:
The package structure is divided into two distinct parts: a first package part containing phosphorescent powder for extended emission, and a second package part without phosphorescent powder for maintaining maximum brightness. This segmentation allows each part to perform its specific function optimally without interfering with the other.
Solution Approach 2:
Different regions of the package structure are assigned different optical properties. The first package part has phosphorescent properties for sustained emission, while the second package part maintains high transparency for immediate bright light output. The interface between these parts is positioned below the top surface of the reflective structure to optimize light extraction.
2Duration of action of moving object
If phosphorescent powder is added at inappropriate location, then the light emission duration is extended, but the maximum brightness is reduced due to light attenuation
Solution Approach 1:
The package structure is divided into two distinct parts: a first package part containing phosphorescent powder for extended emission, and a second package part without phosphorescent powder for maintaining maximum brightness. This segmentation allows each part to perform its specific function optimally without interfering with the other.
Solution Approach 2:
The interface between the first and second package parts is positioned at a specific vertical level (below the top surface of the reflective structure) rather than uniformly distributing phosphorescent powder throughout. This dimensional positioning allows light to escape through the reflective structure's top surface before being attenuated by phosphorescent particles.
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 maintains maximum brightness when the power is on and extends the duration of light emission after power is turned off by minimizing light absorption by phosphorescent powder, while ensuring efficient bonding and phosphorescence.
Implementation Method 1
Phosphorescent powder may be added to a package structure of the light-emitting diode, so that light emission is maintained for a certain period of time when the power of the light-emitting diode is turned off
Implementation Method 2
The reflective structure includes a bottom surface and a lateral part. The light-emitting diode is disposed on the bottom surface. The lateral part is disposed surrounding the bottom surface and disposed on the bottom surface
Data Source
AI summary
A light-emitting device is provided. The light-emitting device includes a light-emitting diode, a reflective structure, and a package structure. The reflective structure includes a bottom surface and a lateral part. The light-emitting diode is disposed on the bottom surface. The lateral part is disposed surrounding the bottom surface and disposed on the bottom surface. The package structure is configured to package the light-emitting diode and the reflective structure. The package structure includes a first package part and a second package part. The first package part has a phosphorescent powder. An interface is between the first package part and the second package part. The interface is disposed below a top surface of the lateral part.