Glass-Encapsulated Quantum Dot Cell for Oxygen Degradation
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Solution Overview
Problem
The luminescence properties of existing light emitting devices using quantum dots degrade easily due to contact with oxygen, leading to short device lifespan.
Innovation Solution
A light emitting device is designed with a cell comprising a pair of glass sheets and a glass-made fused part, where the luminescent material, preferably inorganic phosphors or quantum dots, is encapsulated in an internal space surrounded by glass sheets and a glass ribbon, with a glass sealing member to prevent oxygen contact and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots are used as luminescent material, then luminous efficiency and color rendition are improved, but luminescence properties degrade quickly due to oxygen contact
Solution Approach 1:
The patent encapsulates quantum dots in a sealed cell filled with inert gas (nitrogen or rare gas) to create an oxygen-free environment. This prevents oxidation of quantum dots while maintaining their high luminous efficiency and color rendition properties, thereby resolving the contradiction between luminous performance and luminescence stability.
2Reliability
If glass encapsulation is used to prevent oxygen contact, then luminescence stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent uses thin glass sheets to form a sealed cell structure that encapsulates quantum dots. The glass sheets are bonded together to create a compact, lightweight enclosure that provides effective oxygen barrier protection while maintaining simple geometry and ease of manufacturing, thus resolving the contradiction between protection effectiveness and structural complexity.
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 solution results in a long-life light emitting device with reduced luminescence degradation over time, maintaining high luminous efficiency and color rendition, and is manufactured using a method that involves fusing glass ribbons and sealing members to create a gas-tight, thermally stable cell.
Implementation Method 1
The fused part may be formed by melting a bonding agent containing glass powder by heating.
Implementation Method 2
The fused part may be formed by melting a bonding agent containing glass powder by heating.
Implementation Method 3
a light emitting device using a luminescent material made of quantum dots has been proposed... a film or layer containing quantum dots is disposed on at least a portion of a surface of a waveguide. The light emitting device described in this Patent Literature 1 is a device for emitting, upon irradiation with excitation light, light having a different wavelength from the excitation light.
Data Source
AI summary
Provided are a long-life light emitting device less likely to degrade luminescence properties over time, a method for manufacturing the same, and a cell for a light emitting device used for the same. A light emitting device 1 includes a cell 10 and a luminescent material encapsulated in the cell 10. The cell 10 includes a pair of glass sheets 12 and 13 and a glass-made fused part 14a. The pair of glass sheets 12 and 13 are disposed to face each other with a space therebetween. The fused part 14a is disposed between respective peripheral portions of the pair of glass sheets 12 and 13. The fused part 14a is fused to each of the pair of glass sheets 12 and 13.