According to foreign media reports, researchers from the University of Istanbul, Turkey, developed high-efficiency LEDs, which have quantum dots suspended in liquids.
The researchers pointed out that the quantum dots have a lower emission efficiency when they are taken out of the liquid and then fixed in a solid form. This loss of efficiency is called the matrix effect. Therefore, the researchers eliminated the matrix effect by integrating the liquid into the LED, and finally obtained red, green, and blue (RGB) luminous efficiency of 64 lm/W, and green light (GB) white light luminous efficiency of 105 lm/W.
According to theoretical calculations, the luminous efficiency of liquid QD-LED can reach more than 200 lm / W. The researchers also pointed out that the optical properties of the fluid medium can be changed by replacing it with another fluid medium, and the spectrum can also be adjusted by controlling the mixing ratio of the fluids.
The liquid-based quantum dot solution can increase the luminous efficiency by more than 50% due to the influence of the matrix effect. Second, as the quantum yield of quantum dots increases, the ratio of the number of emitted photons to the number of absorbed photons increases significantly, enabling efficient color conversion and higher white LED efficiency.
The researchers performed additional fine-tuning of the color conversion spectrum to bring its peak close to the peak of the visual function. This fine-tuning achieves a higher luminous efficacy of light emission.