Engineering\nGreen- to Blue-Emitting CsPbBr<sub>3</sub> Quantum Dots in Nanozeolite\nwith High Stability for Backlight Display\nApplication

The performance of blue devices utilizing perovskite\nquantum dots\n(PQDs) has lagged remarkably behind that of green light-emitting diodes\nbecause of low luminescence quantum yields and poor spectral stability.\nHere, benefiting from the rapid and short diffusion paths within the\nnanosized silicalite-1 (N-Si-1) zeolite (∼40 nm) channels,\nCsPbBr<sub>3</sub> PQDs encapsulated within N-Si-1 show a high dispersion\nwith an ultrasmall particle size of ∼2.38 nm and a blue emission\nof 474 nm with a high photoluminescence quantum yield (PLQY) of 44.4%.\nSubsequently, the surface hydrophobization of CsPbBr<sub>3</sub>-N-Si-1\nusing octadecyltrimethoxysilane (ODTMS) enables ultrastable blue luminescence.\nA white-light-emitting diode (WLED) device with CIE color coordinates\n(0.31, 0.28) was constructed by combining CsPbBr<sub>3</sub>-M (blue),\nCsPbBr<sub>3</sub>-N-Si-1 (green), and KSF:Mn<sup>4+</sup> phosphor\n(red) on a 365 nm chip. This work introduces a feasible strategy to\nmodulate the emission of CsPbBr<sub>3</sub> PQDs through a strong\nconfinement effect within a hydrophobic nanozeolite matrix, offering\npromising applications in backlight displays.