P.K. Tawalare, P. P. Lohe, Renuka Nafdey, Shruti Dhale, Nilesh S. Ugemuge, S. V. Moharil
In this review article, a revolution in the use of nanomaterials for wLEDs is discussed thoroughly. Various forms of nanomaterials at the different stages of lamp manufacturingare bringing several novelties and newer applications within the realm of reality. wLEDs with higher and higher brightness are sought after. Efficiency droop and phosphor degradation are obstacles in the way of realising such diodes. Phosphors in nano form enable uniform, more durable coatings and efficient extraction of LED light. Such phosphors can be dispersed in ceramic materials, which makes the phosphor-in-glass (PiG) concept practicable. With a remote phosphor geometry, the problem of phosphor degradation can be solved. Several semiconductors are established light-emitting materials in the NIR region. When these are prepared in nano forms such as QDs, the band gap increases to a value adequate for producing visible light. Rare-earth-free downshifters are ideal phosphors from an optical perspective, with the potential to enable a 30% or larger improvement in LED efficiency as compared to present rare-earth phosphors with improved quality of light. Perhaps the most interesting aspect is the nano-sized LED chip itself. µLED technology is an emerging flat-panel display technology. µLED displays consist of arrays of microscopic LEDs forming the individual pixel elements.