期刊
CHEMICAL ENGINEERING JOURNAL
卷 419, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129551
关键词
CsPbBr3 quantum dots; DDAB capped; Silica-coated; Warm white light-emitting diodes; Visible light communication
资金
- Graduate Scientific Research and Innovation Foundation of Chongqing, China [CYS20064]
- National Natural Science Foundation of China [11974063, 61904023]
- Key Program Science Foundation of Natural Science Foundation of Chongqing [cstc2020jcyj-jqX0028]
- Chongqing Special Postdoctoral Science Foundation [cstc2019jcyj-54bsh0026]
In this study, stable DDAB-capped CsPbBr3 QDs coated with silica were prepared using a simple method, leading to improved PLQY and stability. These QDs were then applied in high-performance WLEDs, demonstrating excellent luminescent performance and potential for visible light communication.
Owing to their superior optical and electronic properties, all inorganic metal halide CsPbX3 (X = Cl, Br, and I) perovskite quantum dots (QDs) are regarded as excellent candidates for various optoelectronic applications. However, the instability of such materials greatly hampers their practical applications. In this work, silica-coated didodecyldimethylammonium bromide (DDAB) capped CsPbBr3 QDs are prepared via a facile method at room temperature. The as-prepared DDAB-CsPbBr3/SiO2 QDs composites demonstrate an effectively improved photoluminescence quantum yield (PLQY) and stability against ethanol and heat. Moreover, the green DDABCsPbBr3/SiO2 QDs composites and red InAgZnS QDs are applied as color-converting layers on a blue LED chip for warm white light-emitting diodes (WLEDs). Such WLEDs exhibit an excellent luminescent performance with a color rendering index (CRI) of 88, a color coordinate of (0.41, 0.38), a correlated color temperature (CCT) of 3209 K, and a high power efficiency of 63.4 lm W-1. Besides, such WLEDs are used for visible light communication (VLC), exhibiting a typical low-pass frequency response, with a corresponding -3 dB bandwidth of about 1.5 MHz. By applying orthogonal frequency division multiplexing (OFDM) with a bit loading, a maximum achievable rate of the VLC system reaches 5.9 Mbps, which is almost four times of their measured -3 dB bandwidth. These results demonstrate the potential of prepared DDAB-CsPbBr3/SiO2 QDs composites not only in high-performance WLEDs, but also as an excitation light source to achieve VLC.
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