High temperature will lead to complete destruction of LED display.The working temperature of the LED display is higher than that of the chip, which will make the LED display's luminous efficiency decrease rapidly, produce obvious light decay and cause damage.
Higher temperature will shorten the life of LED display.The life expectancy of the LED display is its light decay, that is, the time is long, the brightness is getting low, until finally extinguished. Usually defines the LED display luminous flux attenuation 30 of the time for its life.
The light attenuation of phosphors is also a main reason for the fading of LED display, because the decay of phosphor at high temperature is very serious.
Therefore, high temperature is the leading cause of LED display dimming, shortening the life of LED display.
Higher temperature will reduce the luminous efficiency of LED display.
(1) The temperature increases, the electron and the hole concentration will increase, the band width will decrease, the electron migration rate will decrease.
(2) The increase of temperature, the probability of electrons and cavities in the potential well decreases, resulting in the radiation recombination (generating heat), thus reducing the internal quantum efficiency of the LED display.
(3) The temperature rise causes the blue wave of the chip to shift to the long wave direction, so that the emitting wavelength of the chip does not match the excitation wavelength of the phosphor, and the efficiency of the external light extraction of the white LED display is reduced.