Device and method for testing performance of blue light-emitting diode (LED) excitation fluorescent powder

Abstract

The invention discloses a device and method for testing performance of blue light-emitting diode (LED) excitation fluorescent powder and relates to fluorescent powder. The invention provides a device and method for testing performance of blue LED excitation fluorescent powder based on an integrating sphere. The testing device is provided with a fixing base, an integrating sphere, a light outlet barrel, a blue LED light source, a TEC temperature control clamp, a constant current source, a cosine collector, a spectrograph, a computer, a baffle and a standard white board. An LED with the advantages of adjustable spectrum parameters and stable illumination serves as the excitation light source, the light rays reflected by the fluorescent powder are completely collected through the characteristic that the integrating sphere device is closed, a set of fluorescent powder performance measurement system with high applicability is provided, and important luminous performance indexes, such a luminous efficacy, external quantum efficiency and light conversion efficiency, of the fluorescent powder under the actual working conditions can be conveniently and accurately measured and analyzed; meanwhile, the LED excitation light source can be flexibly replaced in the system so as to meet the requirements of different fluorescent powder on different excitation light sources, and the system has good extension performance.

Description

technical field [0001] The invention relates to fluorescent powder, in particular to a device and method for testing the performance of fluorescent powder excited by blue light LEDs. Background technique [0002] As all fields of the world put forward higher requirements for environmental protection and energy saving, in the lighting industry, LED has become the focus of attention from all walks of life. White light sources based on LED lights are widely used in backlight industries such as liquid crystal displays, and in recent years, they have been widely used in flashlights, indoor lighting, and street lighting. White LED lamps have advantages such as small size, high luminous efficiency, long life, energy saving and environmental protection, and are expected to replace traditional incandescent lamps and fluorescent lamps as a new generation of solid-state lighting sources. At present, there are three main technical approaches to realize white light LED: one is to obtain...

AI Technical Summary

Problems solved by technology

In terms of measurement method, although the measurement method of using blue light to directly excite the phosphor to obtain the phosphor spectrum is simple, there are problems such as serious loss of light energy and a large difference between the narrow-band spectrum and the actual LED excitation spectrum.

On the other hand, most phosphor powder test methods do not take into account the effect of the temperature rise of the LED light source on the phosphor excitation efficiency

As the driving current increases, the junction temperature of the LED light source is getting higher and higher, which will easily cause the peak drift of the excitation light source, which will cause deviations in the test of the luminescence performance of the phosphor, resulting in inaccurate measurement results.

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