As everyone knows, the performance level of green LEDs does not reach the same red and blue LED. However, black spots can be reduced by reducing current density, using a larger chip, and optimizing growth conditions, and the distance between LEDs of 190 lm/W at 100 mA drive current can be minimized. Osram 's Andreas L?ffler and Michael Binder said.
The biggest flaw in LED bulbs is second only to the price of the color that is not ideal. This shortcoming is produced by the process of making white LEDs: the GaN-based blue chip excites the yellow phosphor, mixing the two colors to produce white light. In this way, the red region of the visible spectrum does not contribute much to the light output.
A more advanced method of white LED lighting production - a method of solid-state projection display - that is, red, green, and blue LEDs are mixed to produce white light. The advantage of this method is that it is not limited to a higher color rendering index, but also achieves higher light efficiency and flexible control of color.
To produce an energy-efficient system in a mixed color, a high-efficiency light source must be used. The performance of blue and red LEDs has been significant, and recent technological improvements have led to peak power conversion efficiencies exceeding 81% and 70%, but the performance of green LEDs is far behind. The phenomenon that this GaN-based LED is not very effective is called "green light gap".
Green wavelength band
Increasing the efficiency of green LEDs is a major challenge because of the inability to take advantage of the ideal maturity of materials systems. The III-N series used to create high-efficiency blue LEDs will be less efficient at longer wavelengths, while the more efficient Group III phosphides in the red range will face the same distress; The light emitted by the LED emits shorter wavelengths and the efficiency is reduced. In short, the material system is inefficient in the yellow-green spectrum.
Figure 1: Luminous efficiency of Group III nitrides (green data points) and Group III phosphide LEDs (red light data points) at different wavelengths. The blue line represents the corresponding value of the photometric function of the International Commission on Illumination (CIE) in 1924 multiplied by the electro-optical conversion efficiency (WPE). The yellow-green range is marked with a yellow color and is neither sufficiently covered by the Group II nitride nor by the Group III phosphide. This is the essence of the green gap problem.
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