Lighting Device Phosphor Layer Density Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional lighting devices lack efficient light emission spectrum conversion and phosphor layer distribution, which affects the overall light output and substrate protection.
Innovation Solution
A lighting device with a light-emitting element having p-contact and n-contact on a first surface, covered by a phosphor layer with higher density between the contacts, and a circuit substrate with anode and cathode electrodes separated by a phosphor layer, where the light-emitting element is electrically mounted on the electrodes, and the phosphor layers convert the light emission to a longer wavelength range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional phosphor layer is applied uniformly over the light-emitting element, then the manufacturing process is simple, but the light emission spectrum conversion efficiency is insufficient
Solution Approach 1:
The phosphor layer is configured with varying phosphor particle densities at different locations: higher density between the p-contact and n-contact on the first surface to maximize spectrum conversion where light is emitted, and lower density on the second surface to reduce unnecessary material. This local variation in phosphor distribution optimizes conversion efficiency while maintaining manufacturing feasibility through selective application methods.
2Use of energy by moving object
If phosphor particles are densely distributed across the entire light-emitting element surface, then the spectrum conversion is maximized, but the circuit substrate is exposed to excessive light impact
Solution Approach 1:
The phosphor layer strategically concentrates high phosphor particle density in specific regions (between p-contact and n-contact on the first surface) where light emission occurs, while maintaining lower density on the second surface. This localized distribution ensures efficient spectrum conversion at the light source while reducing the overall light burden on the circuit substrate, as the phosphor particles convert light to longer wavelengths primarily where needed.
Solution Approach 2:
The solution addresses the substrate protection issue by utilizing the three-dimensional structure of the light-emitting element. By configuring different phosphor densities on opposite surfaces (first surface between contacts vs. second surface), the patent converts the two-dimensional uniform coating problem into a three-dimensional selective distribution solution, maximizing conversion efficiency while protecting the substrate through spatial differentiation.
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
Enhances light emission spectrum conversion and protects the circuit substrate by efficiently arranging phosphor particles between electrodes, resulting in improved light output and reduced substrate impact.
Implementation Method 1
a phosphor layer that including a phosphor particle and covering the light-emitting element except the p-contact and n-contact of the light-emitting element, and the phosphor layer includes a higher density of the phosphor particle
Implementation Method 2
a light-reflecting layer arranged between the semiconductor light-emitting element and the laminated chip varistor to reflect light from the semiconductor light-emitting element
Data Source
AI summary
In a first aspect of the present inventive subject matter, a lighting device includes a light-emitting device 1 including p-contact and n-contact that are separately arranged from each other on a first surface of the light-emitting element and a phosphor layer including a phosphor particle and covering the light-emitting element 1 except the p-contact and n-contact of the light-emitting element, the phosphor layer includes a higher density of the phosphor particle on a position of the first surface between the p-contact and the n-contact of the light-emitting element than on a position of a second surface that is an opposite surface of the first surface 1b of the light-emitting element.