Dursun, Ibrahim; Shen, Chao; Parida, Manas R.; Pan, Jun; Sarmah, Smritakshi P.; Priante, Davide; AlYami, Noktan Mohammed; Liu, Jiakai; Saidaminov, Makhsud I.; Alias, Mohd Sharizal; Abdelhady, Ahmed L.; Ng, Tien Khee; Mohammed, Omar F.; Ooi, Boon S.; Bakr, Osman(ACS Photonics, American Chemical Society (ACS), 2016-05-31)[Article]
Visible light communication (VLC) is an emerging technology that uses light-emitting diodes (LEDs) or laser diodes for simultaneous illumination and data communication. This technology is envisioned to be a major part of the solution to the current bottlenecks in data and wireless communication. However, the conventional lighting phosphors that are typically integrated with LEDs have limited modulation bandwidth and thus cannot provide the bandwidth required to realize the potential of VLC. In this work, we present a promising light converter for VLC by designing solution-processed CsPbBr3 perovskite nanocrystals (NCs) with a conventional red phosphor. The fabricated CsPbBr3 NCs phosphor-based white light converter exhibits an unprecedented modulation bandwidth of 491 MHz, which is ~ 40 times greater than that of conventional phosphors, and the capability to transmit a high data rate of up to 2 Gbit/s. Moreover, this perovskite enhanced white light source combines ultrafast response characteristics with a high color rendering index of 89 and a low correlated color temperature of 3236 K, thereby enabling dual VLC and solid-state lighting functionalities.
Saidaminov, Makhsud I.; Almutlaq, Jawaher; Sarmah, Smritakshi P.; Dursun, Ibrahim; Zhumekenov, Ayan A.; Begum, Raihana; Pan, Jun; Cho, Nam Chul; Mohammed, Omar F.; Bakr, Osman(ACS Energy Letters, American Chemical Society (ACS), 2016-09-26)[Article]
So-called zero-dimensional perovskites, such as Cs4PbBr6, promise outstanding emissive properties. However, Cs4PbBr6 is mostly prepared by melting of precursors that usually leads to a coformation of undesired phases. Here, we report a simple low-temperature solution-processed synthesis of pure Cs4PbBr6 with remarkable emission properties. We found that pure Cs4PbBr6 in solid form exhibits a 45% photoluminescence quantum yield (PLQY), in contrast to its three-dimensional counterpart, CsPbBr3, which exhibits more than 2 orders of magnitude lower PLQY. Such a PLQY of Cs4PbBr6 is significantly higher than that of other solid forms of lower-dimensional metal halide perovskite derivatives and perovskite nanocrystals. We attribute this dramatic increase in PL to the high exciton binding energy, which we estimate to be ∼353 meV, likely induced by the unique Bergerhoff–Schmitz–Dumont-type crystal structure of Cs4PbBr6, in which metal-halide-comprised octahedra are spatially confined. Our findings bring this class of perovskite derivatives to the forefront of color-converting and light-emitting applications.
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