The present invention aims to develop of novel wavelength converting films with the composited perovskite quantum dots,facilitating the application of this technology for LED backlight module.We applying PQD on chip to the components of LED backlight modules. The PQD-LEDs that are used for the backlight transmitted through a color filter exhibit the ITU-R Recommendation BT.2020 approximately 90

Based upon Coherent Förster Resonance Energy Transfer, we have successfully demonstrated the first colloid quantum dot laser with two different kinds of quantum dots (donorsacceptors) in the light emitting layer. The donors can resonantly transfer energy into the acceptors,they also act as scattering centers. Through multiple scattering, it can form a coherent closed loop. All the donors can coherentlyresonantly transfer energy into all the acceptorsthe laser action is achieved.