Device and method for representing fluorescent powder conversion type LED light effect

A technology of LED light source and fluorescent powder, which is applied in the direction of measuring devices, optical instrument testing, and testing optical properties, etc., can solve the problems of low accuracy and achieve high accuracy and sensitivity, high repeatability of results, and simple operation.

Active Publication Date: 2018-12-18
CHANGZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prior art has studied the relationship between green, yellow, blue, red, yellow and white LED luminous efficiency and photoelectric parameters, and obtained a method of using photoelectric parameters to characterize LED luminous efficacy. , its accuracy is not high

Method used

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  • Device and method for representing fluorescent powder conversion type LED light effect
  • Device and method for representing fluorescent powder conversion type LED light effect
  • Device and method for representing fluorescent powder conversion type LED light effect

Examples

Experimental program
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Effect test

Embodiment 1

[0031] This embodiment provides a device for characterizing the light efficiency of phosphor conversion LEDs, such as figure 1 shown. The device includes a driving power supply 1 , an integrating sphere 2 , a spectrometer 3 , an LED light source 4 , a lamp holder 5 and a thermostat 6 . The LED light source 4 is set on the lamp holder 5, the driving power supply 1 is connected with the computer, and supplies power to the LED light source 4, the lamp holder 5 is set on the thermostat 2, and the thermostat 2 changes the environment of the LED light source 4 by adjusting the temperature of the lamp holder 5 temperature. The signal transmission end of the spectrometer 3 is connected to the computer, its probe reaches the inner wall through the integrating sphere 2 , and the LED light source 4 passes through the integrating sphere to reach the inside of the integrating sphere 2 .

[0032] Preferably, the driving power supply 1 can adopt a digitally controlled high-precision consta...

Embodiment 2

[0036] This embodiment provides a method for characterizing the luminous efficacy of phosphor-converted LEDs. By using the centroid wavelength of the blue light part and the blue-white ratio to describe the relative spectral distribution of the LED, the relationship between the luminous efficacy of the white LED and the relative spectral distribution is established, and then using It is a non-contact detection method to measure the luminous efficiency of white LEDs by measuring the relative spectral distribution during actual work.

[0037] Preferably, during the measurement, the bandwidth of the spectrometer is 1 nm, and the angle between the central axis of the spectrometer probe and the central axis of the LED light source is less than 20 degrees.

[0038] The accuracy of the method of the present embodiment draws by comparing the calibration process and the measurement process:

[0039] Calibration, according to the rated drive current and calibrated use temperature, selec...

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Abstract

The invention provides a device and method for representing fluorescent powder conversion type LED light effect. The device comprises a drive power supply, an integrating sphere, a spectrograph, an LED light source, a lamp holder and a thermostat. The LED light source is set on the lamp holder. The drive power supply supplies power to the LED light source. The lamp holder is set on the thermostat.The thermostat changes environment temperature of the LED light source through adjustment of temperature of the lamp holder. A probe of the spectrograph penetrates the integrating sphere and reachesan inner wall. The LED light source penetrates the integrating sphere and reaches the interior of the integrating sphere. According to the device and the method, operation is simple; accurate measurement is easy to carry out; measurement error robustness is high; result repeatability is high; LED pins are not contacted; LED product light effect is measured according to relative spectrum; the method belongs to a noncontact measurement method; accuracy and sensitivity are high; an instrument requirement is low; measurement error immunity is high; and the device and the method can be used for measuring single LED light effect, also can be used for measuring average light effect of an array composed of a plurality of LEDs and are wide in application range.

Description

technical field [0001] The invention relates to an LED photoelectric detection method, in particular to a method for characterizing the light efficiency of a fluorescent powder conversion type LED by using the blue-white ratio and the centroid wavelength of the blue part. Background technique [0002] LEDs have been widely used in lighting and display fields due to their advantages of energy saving, environmental protection, high luminous efficiency, and low-voltage driving. However, LED luminous efficiency decreases significantly with the increase of junction temperature and current. In actual work, especially in adaptive control, increasing the injection power is often used to increase the light output. At this time, the junction temperature also increases. The meaning of environmental protection. [0003] LED luminous efficacy is the ratio of output luminous flux to injected electric power. The luminous flux is measured by an integrating sphere system or a goniophotome...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02
CPCG01M11/00
Inventor 饶丰邱伟刘娜黄郑霞
Owner CHANGZHOU INST OF TECH
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