How to improve the color performance of white LED Tube
When the chip junction temperature from 25 ℃ to 120 ℃, Blu ray led decay within 5%, white LED light at 30%. This shows that the attenuation of white LED Tube light effect is mainly caused by the fluorescent powder.
We'll focus on the relationship between LED Tube junction temperature and luminous efficiency, as shown in the diagram, when the chip junction temperature from 25 ℃ to 120 ℃, Blu ray LED decay within 5%, white LED Tube light at 30%. This shows that the attenuation of white LED Tube light effect is mainly caused by the fluorescent powder, along with the temperature increase of the chip, phosphor temperature depends on the chip have also increased, high temperature quantum fluorescent powder conversion efficiency decreases, causing attenuation whole white LED Tube light effect,used to excite the Blu ray LED Tube YAG from room temperature to rise to when the temperature is 120 ℃, the conversion efficiency to room temperature 70% ~ 80%, and as the temperature continues to increase, the attenuation exponential increase. This shows that the thermal stability of YAG fluorescent powder than the blue LED Tube chip, which seriously affect the stability and life of white LED Tube light effect. Therefore, on the one hand the need to develop better thermal stability and fluorescence powder materials under higher temperature, the more difficult the development offluorescent powder material. In addition, is the implementation of thermal management of the chip and the fluorescent powder from the packaging structure, reduce the working temperature of the fluorescent powder. Thermal interaction of fluorescent powder and chip fluorescent powder heat source and white light LED Tube structure is a very important and not pay much attention to the subject.