Bright blue-emitting CsPbBr3 nanoplates for white light emitting

Perovskite nanomaterials with highly stable and bright emission were requested for white light emitting diodes (LEDs). In this paper, superior thin CsPbBr 3 nanoplates (NPLs) with an average thickness of 1.9 nm were synthesized via solvothermal reactions. A bright blue-emitting peak at 455 nm with a photoluminescence (PL) quantum yield of 89 % was observed. The high PL efficiency was kept after storing for 90 days at ambient condition. This supplied an efficient approach to solve the problem of low PL efficiency and poor stability of blue-emitting perovskite nanocrystals . The thickness of CsPbBr 3 NPLs was adjusted by changing preparation conditions. The PL peak wavelength of CsPbBr 3 NPLs was adjusted in a region of 455–465 nm. Through dynamic anion exchange promoted cation exchange reactions, Mn ions were introduced in the lattice of CsPbBr 3 NPLs to generate bright orange emitting to create dual-luminescent CsPbBr 3 :Mn NPLs. A white emitting sample with a color coordinate of (0.304, 0.325) was finally fabricated using bright CsPbBr 3 :Mn NPLs and green-emitting CsPbBr 3 nanocrystals. This work broadened the application of perovskite for display and lighting.