Phosphor Light Source Device for High Brightness
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Solution Overview
Problem
Existing light source devices with phosphors face challenges in achieving high brightness due to decreased internal quantum efficiency when exposed to high energy density excitation light, as excited Ce atoms absorb fluorescent light from neighboring atoms, reducing emission efficiency.
Innovation Solution
A light source device incorporating a phosphor layer with specific metal oxide particles, such as those represented by formulas Y3-x1-y1R1y1Cex1Al5-z1Gaz1O12 and Y3-x2-y2R2y2Cex2Al5-z2Scz2O12, where R1 and R2 include Gd and Tb, and x, y, and z values are within specific ranges, to maintain low Ce atom density and prevent further excitation of Ce atoms, thus preserving internal quantum efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high energy density excitation light is used to increase brightness, then light output increases, but internal quantum efficiency decreases due to Ce atom absorption of fluorescent light
Solution Approach 1:
The patent changes the concentration parameter of Ce atoms in the phosphor particles by using specific compositional formulas with controlled x, y, z values. This parameter change reduces Ce atom density to prevent self-absorption of fluorescent light while maintaining sufficient light emission under high energy density excitation
Solution Approach 2:
The patent uses composite phosphor particles containing multiple elements (Y, R, Ce, Al, Ga, Sc, O) in specific ratios defined by the formulas. This composite structure allows optimization of both light emission and reduction of harmful Ce-Ce absorption interactions
2Power
If Ce atom density is increased to enhance fluorescent light emission, then light output increases, but excited Ce atoms absorb more fluorescent light from neighboring atoms
Solution Approach 1:
The patent optimizes the Ce atom concentration parameter through controlled substitution in the phosphor formula, balancing light emission capability with minimization of self-absorption effects by maintaining specific x, y, z value ranges
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 enables efficient production of high-brightness light by suppressing the decrease in internal quantum efficiency even at high energy densities, allowing for effective light emission with minimal absorption of fluorescent light by excited Ce atoms.
Implementation Method 1
Light of the excitation light source is applied as excitation light to the phosphor, and fluorescent light having a wavelength longer than a wavelength of the excitation light is emitted from the phosphor
Implementation Method 2
Phosphor 840 converts a wavelength of the light emitted by light emitting layer 810
Data Source
AI summary
A light source device includes: an excitation light source that emits excitation light having an energy density of 10 W/mm2 or more; and a phosphor layer that has phosphor particles embedded in the matrix. The phosphor particles include at least one selected from the group consisting of metal oxides represented by a following formula (1) and metal oxides represented by a following formula (2).Y3-x1-y1R1y1Cex1Al5-z1Gaz1O12 (1)Y3-x2-y2R2y2Cex2Al5-z2Scz2O12 (2)In the formula (1), R1 includes at least one selected from the group consisting of Gd and Tb, and x1, y1, and z1 satisfy 0.003≤x1≤0.03, 0≤y1≤2.1, and 0≤z1≤2.2, respectively. In the formula (2), R2 includes at least one selected from the group consisting of Gd and Tb, and x2, y2, and z2 satisfy 0.003≤x2≤0.03, 0≤y2≤2.1 and 0≤z2≤1.5, respectively.