A team at Koc University in Istanbul, Turkey, has developed an efficient LED.
The researchers placed the quantum dots in the liquid directly in the LED device, emitting 50 percent more light than those in the solid state.
The researchers covered the LED with a transparent polydimethylsiloxane (PDMS) lens and injected the lens with liquid mixed with colloidal quantum dots for color conversion and luminescence.
The lens will automatically repair the injection hole after injecting the liquid, preventing the liquid from leaking out.
The researchers point out that when the quantum dots are taken out of the liquid, they are less efficient when they are used in solid form.
The lost efficiency is called the matrix effect.
By locating in a liquid, with high quantum yields and adjustable quantum dots, the researchers were able to suppress the matrix effect.
Due to the reduction of matrix effect, the luminous efficiency is also greatly improved in LED with red, blue and green light as the light source. Each watt can emit 64 lm, while green and blue leds as the light source can reach 105 lm per watt.