Fluorescent Material Coated with Aluminum Hydroxide for Durability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing light emitting devices using fluorescent materials for red light emission suffer from low durability, leading to adhesiveness issues between the fluorescent material and resin, which affects light emission efficiency and device reliability.
Innovation Solution
A fluoride-containing fluorescent material core with Mn, incorporating alkali metal elements, NH4+, Group 4, and Group 14 elements, coated with aluminum hydroxide or calcium hydroxide particles to enhance durability, is developed, along with a method involving dispersion in a liquid medium and separation to adhere these particles firmly to the core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a fluoride fluorescent material (K2SiF6:Mn4+) is used for red light emission, then the light emission efficiency is improved, but the durability of the fluorescent material deteriorates
Solution Approach 1:
The patent applies composite materials by combining the fluoride fluorescent material core with a silicate glass coating layer. The core material (K2SiF6:Mn4+) provides high light emission efficiency, while the silicate glass coating provides durability and protection. This composite structure allows the fluorescent material to maintain both high illumination intensity and improved reliability by protecting the core from degradation while preserving its optical properties.
2Illumination intensity
If the fluorescent material is used in light emitting devices, then the light emission performance is improved, but adhesiveness issues between the fluorescent material and resin occur
Solution Approach 1:
The silicate glass coating creates a composite structure that improves adhesiveness between the fluorescent material and the resin matrix. The glass coating provides a surface that bonds well with both the fluorescent core and the surrounding resin, eliminating adhesiveness issues while maintaining the high light emission performance of the original fluorescent material.
Solution Approach 2:
The silicate glass coating forms a thin film layer around the fluorescent material core. This thin film serves as an interface that ensures good adhesion to the resin matrix while preserving the optical and emission properties of the underlying fluorescent material, thus maintaining light emission performance while improving bonding strength.
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 significantly improves the durability of the fluorescent material, maintaining high light emission intensity and reducing chromaticity changes, thus enhancing the overall performance and longevity of the light emitting device.
Implementation Method 1
allowing at least one of an aluminum hydroxide particle and a calcium hydroxide particle to adhere to the fluorescent material core
Implementation Method 2
a fluorescent material that emits red light and a fluorescent material that emits green light, each of which is excited by the light from the excitation light source
Data Source
AI summary
Provided are a fluorescent material with excellent durability, which emits red light, a method of producing the same, and a light emitting device. The fluorescent material is a fluorescent material including a fluoride-containing fluorescent material core comprising Mn, at least one element selected from the group consisting of an alkali metal element and NH4<sup2>+</sup2>, and at least one element selected from the group consisting of a Group 4 element and a Group 14 element in a composition thereof; and at least one of an aluminum hydroxide particle and a calcium hydroxide particle as disposed on a surface of the fluorescent material core.