White LED LED luminous efficiency record


Researchers at the Optical Society of America have used nanomaterials to create white LEDs with a luminous efficacy of 105 lumens per watt and a new record. After further research, the researchers have achieved a luminous efficacy of 200 lumens per watt, which can be applied in the home, office or television fields in the future.

Currently, white LEDs on the market are mainly made by covering a blue LED with a layer of yellow phosphor. However, due to the wide range of spectrum emitted by the phosphor, it is difficult to make white light adjustments on the details. This time, the researchers combined the blue LED with a flexible lens, which placed nano-scale semiconductor particles, which are quantum dots. When the quantum dots are illuminated by blue light, green and red light will be emitted, and the blue, green and red light will be combined into white light.

In order to create a new white LED, the researchers placed a solvent mixed with cadmium, zinc, selenium and other materials and quantum dots in the lens and LED chip, and used a special silicone lens to make light. In addition to the transfer, it also ensures that the solvent does not seep out when it is placed in the lens. The researchers pointed out that white LEDs emitted through liquids are twice as efficient as LED light emitted through solid-state films.