Higher temperature will reduce the luminous efficiency of LED display.
The temperature increases, the electron and the hole concentration will increase, the band width will decrease, the electron migration rate will decrease.
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.
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.
h the excitation wavelength of the phosphor, and the efficiency of the external light extraction of the white LED display is reduced.