Effect Of Rapid Thermal Fatigue On Optical Properties Of LED

Different from other artificial light sources,LED light source technology has the advantages of high photoelectric conversion efficiency,long service life and low energy consumption,which makes LED lighting products not only use low energy consumption cost,but also the comprehensive cost of the overall product cycle is far lower than other light source products,so it has extremely excellent economic competitiveness,which promotes lighting level led As an artificial light source,it is more and more widely used in agricultural production.The revolutionary significance of LED light source technology is that it can regulate the light quality it emits,that is to say,we can modulate different light spectrum according to the difference of plant growth and development needs to achieve on-demand light.As the intelligent adjustment of agricultural production factors,artificial light can realize the regulation of artificial light quality in the research of light quality biology.With the development of light quality biology and ecological agriculture strategy,the reliability of LED optical performance is required to be higher.The theoretical life of LED is usually tens of thousands of hours.Based on the failure mechanism of LED components,it is of great significance to evaluate the reliability and change of the optical performance of LED in the effective life by using the fast thermal fatigue method.In order to realize the fast thermal fatigue method to simulate the reliability and changing characteristics of the optical performance of LED under the action of temperature cycle,we choose the method of high frequency induction heating as the means to realize the fast heating;in order to achieve the fast cooling effect,we choose a cylindrical cavity body,which can rapidly reduce the LED when the water flows through quickly The temperature of the sample,so as to achieve the simulation of temperature cycling.For simulating the high and low temperature humidity conditions,the high and low temperature humidity test chamber is selected directly,and the LED sample is put into the test chamber to simulate the temperature cycling effect.The optical properties of the LED samples are measured by the LED photochromic and electrical comprehensive performance test system,and the optical performance parameters of the LED samples are obtained and analyzed.By analyzing the change of the optical performance parameters of the LED element under the action of temperature cycle,it shows that the optical performance of the LED element shows a general trend of attenuation in the effective life(the decrease of the luminous flux is not more than 15%).It shows that under the workingstate of the LED element,the effect of temperature cycle is very obvious,and the optical performance shows a significant decline in the effective life.For a certain humidity environment,the change of optical performance of LED is very small after the temperature cycling.This shows that the high-power LED element has a good adaptability to the humidity environment,and its optical performance is very little affected by the environmental humidity conditions.