Abstract
All‐inorganic perovskite quantum dots (PQDs) have held significant promise for developing cadmium‐free light‐emitting devices due to their outstanding color purity and tunable bandgap throughout the visible spectrum. However, they are still limited in practical applications due to stability issues. Herein, a strategy is developed to replace traditional ligands such as oleylamine and oleic acid for improving the binding state between exposed Pb ions and ligands by sulfate‐functionalized cellulose nanocrystals (CNCs) to synthesize red‐, green‐, and blue‐emitting PQD/CNC light enhancement films. To further increase the stability of red‐emitting films, Zn metal ions are introduced in the B‐cation site of CsPbI3. It is noticed that the relative photoluminescence emission intensity of the Zn‐alloyed CsPbI3 PQD/CNC film can be maintained at 93% under the ambient condition for 33 days, whereas that of both the unalloyed film and colloidal Zn‐alloyed CsPbI3 PQD dropped to ≈50% after 1 h. Thus, the developed PQD/CNC enhancement films can provide a new possibility for highly stable and full‐color applications in the next‐generation low‐cost, low‐power‐consumption, and efficient PQD‐based optoelectronic devices.
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