We report efficient conversion of any of the primary colors to white light under ambient conditions, by ZnO nanostructures.
Not only UV, blue, and NIR LEDs, but also the green and red LEDs can be used for the production of white light. The conversion efficiency
is supposed to be high and it is possible to tune the nature of white light (warm, natural and cool). Correlated color temperature
can be tailored by changing the excitation source. The white light emission does not depend on vacuum, or doping or any magic size or
any specific design of nanocrystal.