Chih Hao Chiang1,Meng Lin Tsai1
National Taiwan University of Science and Technology1
Chih Hao Chiang1,Meng Lin Tsai1
National Taiwan University of Science and Technology1
In the past two decades, 0D perovskite quantum dots (PQDs) attract a lot of attentions in optoelectronic industry and academia due to the narrow emission full width at half maximum (FWHM), tunable bandgap, and high photoluminescence quantum yield (PLQY). Owing to these advantages, PQDs are regarded as the new blue ocean for developing next-generation displays. However, the poor stability of PQDs is the most serious drawback for the further application and commercialize. In order to overcome the stability issue, we developed a strategy to stabilize PQDs by applying surface functionalized cellulose nanocrystals (CNCs) to replace traditional ligands and successfully synthesized the highly stable and color-tunable PQDs/CNCs luminescent films. Nevertheless, the PLQY of the PQDs/CNCs luminescent films is limited due to large crystals formed during the synthesis process. After investigation, we incorporate phenethylammonium halide (PEAX, X = Cl, Br, and I) during the synthesis process to format quasi-2D perovskite structures instead of the PQDs and the PLQY of CsPbBr<sub>1.5</sub>Cl<sub>1.5</sub>, CsPbBr<sub>3</sub>, and CsPbBr<sub>0.5</sub>I<sub>2.5</sub> films with PEAX passivation can be enhanced more than 10 (from 1.2% to 10%), 3 (from 22% to 69%), and 18 (from 3% to 55%) times, respectively. Moreover, the stability of PEAX passivated inorganic perovskite/ CNCs luminescent films also slightly increase. By combining the advantages of CNC and PEAX, this study demonstrates highly stable light emission/conversion films with largely enhanced PLQY, and it holds the potential for developing full-color, stable, and high PLQY displays in the future.