The Reason Why Temperature Affects The Light Efficiency Of LED Display

(1) As the temperature increases, the concentration of electrons and holes increases, the band gap decreases, and the electron mobility decreases.

(2) When the temperature increases, the radiative recombination probability of electrons and holes in the potential well decreases, resulting in non-radiative recombination (heating), thereby reducing the internal quantum efficiency of the LED display.

(3) The increase in temperature causes the blue wave peak of the chip to shift to the long wave direction, which makes the emission wavelength of the chip do not match the excitation wavelength of the phosphor, and also reduces the external light extraction efficiency of the white LED display.

(4) As the temperature increases, the quantum efficiency of the phosphor decreases, the luminescence decreases, and the external light extraction efficiency of the LED display decreases.

(5) The performance of silica gel is greatly affected by the ambient temperature. As the temperature increases, the thermal stress in the silica gel increases, resulting in a decrease in the refractive index of the silica gel, which affects the light efficiency of the LED display.