Manganese-Doped Phosphor Thermal Management in High Power Density Lighting
Solution Overview
Problem
Conventional phosphor materials in high power density lighting devices suffer from low thermal conductivity and thermal quenching, leading to deterioration and performance limitations under high power density conditions.
Innovation Solution
A manganese-doped complex fluoride phosphor material in a monolithic or composite form, radiationally coupled with a semiconductor light source, is used to enhance thermal management and maintain performance in high power density applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional phosphor materials are used in high power density lighting devices, then the device can operate at high power density, but the phosphor materials exhibit low thermal conductivity and thermal quenching leading to deterioration and damage
Solution Approach 1:
The patent changes the physical and chemical parameters of the phosphor material by doping manganese ions into complex fluoride structures (e.g., K2SiF6, K2TiF6, Cs2SiF6). This doping modifies the thermal and optical properties, improving thermal conductivity and reducing thermal quenching effects, thereby maintaining phosphor stability at high power density conditions
Solution Approach 2:
The patent employs composite phosphor materials combining manganese-doped complex fluorides with other phosphor compounds or resin matrices. These composite structures leverage the high thermal conductivity of the manganese-doped phase while maintaining the luminescent properties needed for high power density operation, preventing material deterioration
2Power
If conventional phosphor materials are used in high power density lighting devices, then the device can operate at high power density, but the heat generated causes thermal quenching and deterioration of phosphor materials
Solution Approach 1:
The manganese-doped complex fluoride phosphor acts as an intermediary material between the blue-emitting semiconductor device and the final light output. This intermediary has high thermal conductivity that facilitates heat dissipation from the semiconductor junction, reducing thermal quenching effects and maintaining phosphor stability at elevated temperatures
Solution Approach 2:
The patent modifies thermal parameters by incorporating manganese dopants into the phosphor crystal structure, which changes the phonon transport properties and increases thermal conductivity. This parameter change enables the phosphor to withstand higher operating temperatures without thermal quenching or deterioration
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 manganese-doped phosphor materials improve the thermal stability and performance of high power density lighting devices by maintaining quantum efficiency and preventing deterioration, enabling the production of high power density blue light sources.
Implementation Method 1
incorporate phosphor into these light emitting devices to enhance the emitted radiation in a particular wavelength region and/or to convert at least some of radiation to another wavelength region
Implementation Method 2
the phosphor materials improve the thermal stability and performance of high power density lighting devices
Data Source
AI summary
A lighting apparatus is presented. The lighting apparatus includes a semiconductor light source capable of producing blue light of high power density, the semiconductor light source radiationally coupled to a phosphor of formula I in a monolithic form selected from single crystal and ceramic, Ax (M, Mn)Fy (I) where A is Li, Na, K, Rb, Cs, or a combination thereof, M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or a combination thereof, x is an absolute value of a charge of an [MFy] ion; and y is 5, 6, or 7.