Abstract
Abstract Blue-emissive nanocrystals (NCs) with high photoluminescence quantum yields (PL QYs) and excellent stability are essential for lighting and displays. Here, a facile top-down approach (including two steps: thermal annealing and ultrasonic treatment) by using aluminum acetylacetonate (Al(acac)3) as a precursor is adopted to fabricate blue-emissive Al(acac)3 NCs with high PL QY reaching 81.8%, the highest reported value for the aluminum compound-based NCs so far. Additionally, the as-fabricated Al(acac)3 NC solution (in toluene) exhibits high stability under air atmosphere condition, maintaining 61.2% of initial PL QY after 1 year. Furthermore, solution-processed Al(acac)3 NCs/poly(methyl methacrylate) (PMMA) composite film with blue emission is demonstrated. Finally, combinations of the blue-emitting Al(acac)3 NCs/PMMA composite film with red-emitting and green-emitting CuInS2 composite films are realized, resulting in remote ultraviolet-pumped white light-emitting diodes with a high color rendering index of 91. These findings inform new blue-emissive NCs and composite films, potentially paving the way to design new structures of lighting and display devices.
Highlights
Phosphor-converted white light-emitting diodes (pc-WLEDs) have been indispensable sources in lighting industry and display systems due to their energy savings, environment-friendliness, and long persistence [1,2,3,4,5]
Blue-emissive nanocrystals (NCs) with high photoluminescence quantum yields (PL QYs) and excellent stability are essential for lighting and displays
Combinations of the blue-emitting Al(acac)3 NCs/poly(methyl methacrylate) (PMMA) composition film with red- and greenemitting CuInS2 composite films result in remote UV-WLEDs with a high color rendering index (CRI) of 91
Summary
Phosphor-converted white light-emitting diodes (pc-WLEDs) have been indispensable sources in lighting industry and display systems due to their energy savings, environment-friendliness, and long persistence [1,2,3,4,5]. In respect to the aforementioned issues, remote ultraviolet-pumped WLEDs (UVWLEDs) have received great attention [8,9,10] This type of WLEDs can reduce the thermal degradation and reabsorption of phosphors, and decrease the potential blue light hazard. In our recent previous works, we developed blue-emitting aluminum hydroxide (PL QY, 69%) with broad PL spectrum by using a single precursor decomposition method [34, 35] They exhibit poor solubility in solution and unsatisfactory compatibility with polymers, showing not suitable for using in remote UV-WLEDs. we fabricated blue-emitting aluminum acetylacetonate [Al(acac)3] NCs for the first time by using a facile top-down approach with Al(acac) as a precursor, which contain two steps including (i) thermal annealing aiming to improve the crystallinity of the raw material and (ii) ultrasonic treatment to disintegrate the high crystalline precursor. Combinations of the blue-emitting Al(acac) NCs/PMMA composition film with red- and greenemitting CuInS2 composite films result in remote UV-WLEDs with a high color rendering index (CRI) of 91
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