High-Bandwidth White-Light System Combining a Micro-LED with Perovskite Quantum Dots for Visible Light Communication

Abstract

This work proposes a high-bandwidth white-light system consisting of a blue gallium nitride (GaN) micro-LED (μLED) exciting yellow-emitting CsPbBrI perovskite quantum dots (YQDs) for high-speed real-time visible light communication (VLC). The packaged 80 μm × 80 μm blue-emitting μLED has a modulation bandwidth of ∼160 MHz and a peak emission wavelength of ∼445 nm. The achievable bandwidth of the white-light system is up to 85 MHz in the absence of filters and equalization technology. Meanwhile, the bandwidth of the YQDs as a color converter is as high as 73 MHz with the blue GaN μLED as the pump source. A maximum data rate of 300 Mbps can be achieved by taking advantage of the high bandwidth of the white-light system using the non-return-to-zero on-off keying (NRZ-OOK) modulation scheme. The resultant bit-error rate is 2.0 × 10, well beneath the forward error correction criterion of 3.8 × 10 required for error-free data transmission. In addition, the YQDs which we proposed as a color converter possess high stability for VLC. After half a year, the achievable bandwidths of the white-light system and the YQDs are still up to 83 and 70 MHz, respectively. This study provides the direction of developing high-bandwidth white-light system for both high-efficiency solid-state lighting and high-speed VLC.

Light Generation in Lead Halide Perovskite Nanocrystals: LEDs, Color Converters, Lasers, and Other Applications

“…e) Eye diagrams versus data rates of WLEDs (µLED + CsPbBr1.8I1.2 yellow LHP QDs) at 280 Mbps. Reproduced with permission . Copyright 2018, American Chemical Society.…”

“…The prompt exciton radiative recombination and rapid photon response of LHP‐NC phosphors lead to their potential application in short‐distance wireless data transmission technology, i.e., Li‐Fi, an emerging branch of lighting applications for white LEDs (Figure e) . Mixing CsPbBr 3 NCs with conventional red phosphors produces white color converters that exhibit a modulation bandwidth of 491 MHz and a high data transmission rate of up to 2 Gbit s −1 . Meanwhile, as qualified lighting devices, the corresponding white LEDs demonstrate an efficient warm white emission with a CRI of ≈89 …”

“…Light emission from lead halide perovskites (LHPs) was reported over a decade ago; however, weak emissions at room temperature hindered the application of LHPs in light‐emitting devices because LHPs did not show any electroluminescence at the time . In the past few years, LHPs have returned to the spotlight in the form of nanoscale emitters because of their superior features in light generation and resulting applications . Low‐cost solution processing techniques are used to fabricate LHP nanocrystals (LHP‐NCs), and impressive achievements have been made in using LHP‐NCs in high‐brightness light‐emitting diodes (LEDs) with high external quantum efficiency (EQE) and as color converters for lighting and full‐color displays that have a wide color gamut and near‐unity luminous efficiency .…”

“…Low‐cost solution processing techniques are used to fabricate LHP nanocrystals (LHP‐NCs), and impressive achievements have been made in using LHP‐NCs in high‐brightness light‐emitting diodes (LEDs) with high external quantum efficiency (EQE) and as color converters for lighting and full‐color displays that have a wide color gamut and near‐unity luminous efficiency . The prompt emission of LHP‐NCs has resulted in their being selected as color converters for light indoor fidelity (Li‐Fi) in short‐distance wireless data transmission . As the most attractive application, red and green LEDs exhibit much higher performances with EQEs >20% and high brightness that are comparable to organic LEDs and CdSe quantum dot LEDs; however, blue LEDs still have an EQE of ≈5.7% and a maximum brightness of 3780 cd m −2 .…”

Design Principle of Reactive Components for Dimethacrylate‐Terminated Quantum Dots: Preserved Photoluminescent Quantum Yield, Excellent Pattern Uniformity, and Suppression of Aggregation in the Matrix

“…Semiconductor quantum dots (e.g., II‐VI, IV‐VI QDs)1–3 attract a lot of attention due to their excellent optical properties (e.g., narrow emission, high luminous efficiency) and the ease of adjustment of solution processing4–10 based on surface chemistry 11–14. As a result, applications for cost‐effective wet‐based manufacturing systems as well as various optoelectronic devices, for example, color converting thin‐films and printable inks for advanced liquid crystal displays,4,15,16 micro‐light emitting diodes,17 luminescent solar concentrators,18,19 and smart lighting systems (e.g., visible light communication),20–23,15 are being actively developed.…”