UV Light-Emitting Device Gap Structure for Oxygen Supply
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Solution Overview
Problem
Light-emitting devices emitting ultraviolet light face issues with light extraction due to black deposits, which are exacerbated by inadequate oxygen supply and air flow, leading to decreased reliability and efficiency.
Innovation Solution
A light-emitting device configuration that includes a substrate with multiple upper surfaces, a light-emitting element on one surface, a protective element on another, and adhesive members creating a gap for air flow, along with a cap and light-transmissive member to enhance light extraction and prevent deposit adhesion, utilizing reflective films and inclined inner lateral surfaces to direct light efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light-emitting device emits ultraviolet light, then light extraction is achieved, but black deposits form on the light-emitting element leading to decreased light extraction efficiency
Solution Approach 1:
The patent extracts the harmful black deposits from the light-emitting element surface by providing a gap structure that enables air flow to reach the light-emitting element. This allows oxygen to be supplied to oxidize and remove the carbon-based deposits, thereby restoring and maintaining light extraction efficiency.
Solution Approach 2:
The patent applies pneumatic principles by creating a gap structure that enables air flow through the light-emitting device. The gap allows atmospheric air to reach the light-emitting element, providing oxygen for oxidative removal of black deposits and maintaining optical performance.
2Strength
If adhesive members are used to bond the frame to the substrate, then structural support is provided, but air flow to the light-emitting element is blocked
Solution Approach 1:
The adhesive members are segmented into discrete portions arranged in a pattern that provides structural bonding while leaving gaps between them. This segmentation allows air flow to pass through to the light-emitting element while maintaining the structural integrity of the device.
Solution Approach 2:
The adhesive members are strategically positioned with specific spacing and arrangement to create localized bonding zones while maintaining open channels for air flow. This local quality optimization ensures both structural support and adequate oxygen supply to prevent deposit formation.
3Volume of moving object
If the frame is positioned close to the substrate, then device compactness is achieved, but air flow and oxygen supply to the light-emitting element are insufficient
Solution Approach 1:
The patent introduces a vertical dimension (gap height) to enable air flow while maintaining horizontal compactness. The gap structure provides a three-dimensional pathway for oxygen supply without significantly increasing the overall device footprint, thus maintaining compactness while ensuring adequate oxygen supply.
4Device complexity
If no protective element is provided, then device simplicity is maintained, but the light-emitting element is exposed to contaminants and degradation
Solution Approach 1:
The protective element serves as an intermediary component that shields the light-emitting element from external contaminants while allowing air flow to reach it. This mediator structure provides environmental protection without blocking the oxygen supply needed to prevent black deposit formation.
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
The configuration ensures smooth air flow and reduces adhesion of black deposits, maintaining high reliability and efficient light extraction by allowing sufficient oxygen supply and directing light effectively, thus preventing decreases in light extraction efficiency.
Implementation Method 1
A space in which the light-emitting element is provided communicates with an outside of the light-emitting device via the gap
Implementation Method 2
The light-emitting element is to emit ultraviolet light
Implementation Method 3
utilizing reflective films and inclined inner lateral surfaces to direct light efficiently
Data Source
AI summary
A light-emitting device includes a substrate including a substrate second upper surface provided between a substrate bottom surface and a substrate first upper surface in a height direction. A light-emitting element to emit ultraviolet light is provided on the substrate first upper surface. A protective element includes a protective element upper surface provided between the substrate first upper surface and the substrate second upper surface in the height direction. A frame is bonded to the substrate first upper surface via adhesive members to surround the light-emitting element. The frame includes a frame lower surface opposite to the substrate first upper surface and the substrate second upper surface in the height direction to provide a gap between the substrate first upper surface and the frame lower surface. A space in which the light-emitting element is provided communicates with an outside of the light-emitting device via the gap.