Anion Exchange Perovskite Quantum-Dots for Highly Efficient Light-Emitting-Devices

All inorganic cesium lead halide perovskite with CsPbX 3 (X = Cl − , Br − , or I − ) have been demonstrated a novel classified colloidal quantum dots (QDs). 1) Perovskite QDs have also expected great potential for the application in light-emitting devices (LEDs) due to their superior chemical stability, narrow emission spectra enable coverage the next generation of standard for display, B.T. 2020 color gamut, high photoluminescence quantum yields (PLQYs) of up to 90%, plainly tunable emission wavelength in full visible range by halide anion composition (X site = Cl − for blue emission, Br − for green emission, or I − for red emission) or size of QDs. Perovskite QDs are consisted almost entirely of inorganic elements, the energy levels of perovskite QDs are similar to the organic light-emitting materials, which lead to fabrication of device with similar structure of organic light-emitting devices (OLEDs). The external quantum efficiency (EQE) of LEDs based on CsPbX 3 QDs have rapidly increased from 0.1% to over 20% for past only few years. 2 – 5)