Highly Photoluminescent Yb-Doped CsPbBrI₂ Nanocrystals in Ethylene Vinyl Acetate Composite Films for Wide Color Gamut Backlight Displays

Abstract

Metal halide CsPbX 3 (X = Cl, Br, I) perovskite nanocrystals (NCs) have been widely studied because of their high photoluminescent quantum yield (PLQY) and tunable emission wavelength. However, their weak hydrothermal stability greatly limits the use of CsPbX 3 NCs under harsh conditions. This work successfully solved the problem of poor stability of CsPbX 3 NCs through the ethylene vinyl acetate (EVA) film coating strategy and expanded the application range of CsPbX 3 NCs. In addition, we demonstrated an improved Yb-doped hot injection strategy, successfully prepared a Ybdoped CsPbBrI 2 NC in EVA composite film (CsPbBrI 2 NCs/ECF), and improved the PLQY of the prepared CsPbBrI 2 NCs/ECF. Furthermore, this work studied the application of CsPbX 3 NCs/ECF in the field of backlight displays. The results show that CsPbX 3 NCs/ECF has a wide color gamut, which reaches 119.9% of the National Television Standards Committee 1953 standard color gamut and 89.2% of the Rec. 2020 standard color gamut.

Elevating standard-red perovskite LED performance: unleashing optimal potential with complex HTL and insert modification layer

“…Furthermore, KBr modification passivates surface defects, leading to a decrease in non-radiative recombination centers and fostering higher PLQY. However, an excessive amount of KBr may introduce new defects, potentially undermining PLQY [23].…”

Ytterbium-Doped Lead–Halide Perovskite Nanocrystals: Synthesis, Near-Infrared Emission, and Open-Source Machine Learning Model for Prediction of Optical Properties

“…Different from the deep traps, shallow traps facilitate an increase in electron density in the conduction band of the perovskite host and, hence, may lead to PL enhancement. Zhou et al showed that Yb-doping can increase the PL QY from 30 to 50% for CsPbBrI 2 pNCs [ 49 ]. Doping with divalent Yb 2+ ions can also result in the improvement of the environmental and thermal stability of perovskite materials, as was shown for Yb 2+ -alloyed CsPb 1−x Yb x I 3 pNCs [ 50 ].…”