Abstract
We present an iterative optical and thermal simulation procedure which enables the determination of the temperature distribution in the phosphor layer of a phosphor converted LED with good accuracy. Using the simulation both the highest phosphor temperatures, which are mostly relevant to material degradation as well as the temperatures of those phosphor particles which mainly contribute to converted light emission can be determined. We compare the simulations with experimental studies on the phosphor temperature. While infrared thermography only gives information on the phosphor layer surface temperature, phosphor thermometry provides temperature data on the volume temperature of the phosphor layer relevant to color conversion.
Highlights
Even though the last few years have witnessed an increasing market penetration of solid state lighting sources, light-emitting diode (LED) based lighting solutions are a long way from reaching their full potentials[1]
The die itself is mounted on a printed circuit board (PCB) by an adhesive layer with a thickness of 5 μm
The iterative optical and thermal simulation procedure presented here allows the determination of the temperature distribution in the CCE of a phosphor converted LED with good accuracy
Summary
The simulation model consists of a square-shaped CCE with a flat surface attached to a blue emitting LED die by an adhesive layer. The iterative thermal and optical simulation method presented here allows the determination of the volume resolved temperature distribution within the CCE while infrared thermography is restricted to the surface It needs to be kept in mind, that most of the blue LED light is absorbed and converted into yellow light close to the LED die surface. Even in case of perfect heat dissipation from the CCE, one can apply phosphor thermometry at least to ensure that the phosphor and its emission do not suffer from notable thermal impacts upon LED operation
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