InGaN µLEDs integrated onto colloidal quantum dot functionalized ultra-thin glass

Rae, Katherine J.; Foucher, C.; Guilhabert, Benoit; Islim, Mohamed Sufyan; Yin, Liang; Zhu, Dandan; Oliver, R.A.; Wallis, D. J.; Haas, Harald; Laurand, N.; Dawson, Martin D.

doi:10.1364/oe.25.019179

Cited by 12 publications

(4 citation statements)

References 15 publications

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“…Although the μLEDs can provide a higher modulation bandwidth, the complicated process in the red wavelength band limits its direct application as a white-light source. Meanwhile, compared with LEDs, LDs have a more complex manufacturing process, higher power consumption and cost, and worse thermal stability, which limits its lifespan in indoor VLC applications. , Therefore, many color-converter materials have been proposed and experimentally demonstrated to address the illumination problems of LEDs in the VLC system, including organic and inorganic compounds. − Among them, nanocrystals (NCs), also called quantum dots (QDs), are one of the most potential candidates. Due to a high photoluminescence (PL) quantum yield and direct radiative recombination, the fluorescence of these QDs always happens in a time range of nanoseconds, which correlates to a theoretical −3 dB frequency response up to tens or hundreds of MHz scale (usually ∼40 to 200 MHz) .…”

Section: Introductionmentioning

confidence: 99%

Encapsulation-Enabled Perovskite–PMMA Films Combining a Micro-LED for High-Speed White-Light Communication

Wang

Wei

Cai

et al. 2021

ACS Appl. Mater. Interfaces

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Cesium lead halide perovskite nanocrystals have recently become emerging materials for color conversion in visible light communication (VLC) and solid-state lighting (SSL), due to their fast response and desirable optical properties. Herein, perovskite nanocrystal-polymethyl methacrylate (PNC-PMMA) films with red and yellow emission are prepared. The PNC-PMMA films, with optical properties such as a short lifetime and air stability, are used to make broadband color converters based on a high-bandwidth 75 μm blue micro-LED (μLED) for VLC. The yellow-emitting CsPb(Br/I)3 PNC-PMMA has a high bandwidth of 347 MHz, while the red-emitting CsPbI3 PNC-PMMA exhibits a higher modulation bandwidth of 822 MHz, which is ∼65 times larger than that of conventional phosphors. After fixing the two PNC-PMMA films in front of the μLED, a qualified warm white light is generated with a correlated color temperature of 5670 K, a color rendering index of 75.7, and a de L’Eclairage (CIE) coordinate at (0.33, 0.35). Although the color conversion of the blue light sacrifices some received power and slightly reduces the overall bandwidth from 1.130 to 1.005 GHz, a maximum real-time data rate of 1.7 Gbps is still achievable using the non-return-to-zero on–off keying modulation scheme, which is ∼6 times higher than that of the previous record. This study provides a practical approach to develop a considerably high-bandwidth white-light system for both high-speed VLC and high-quality SSL.

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Section: Introductionmentioning

confidence: 99%

Encapsulation-Enabled Perovskite–PMMA Films Combining a Micro-LED for High-Speed White-Light Communication

Wang

Wei

Cai

et al. 2021

ACS Appl. Mater. Interfaces

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“…In addition, since QDs have a shorter light-emitting life, they have a faster modulation response speed, and their narrow emission linewidth gives them have a good color purity, which provides the possibility of wavelength division multiplexing for visible light communication. Thus, QD-converted full-color micro-LEDs are not only used for displays but also widely applied in visible light communication [73][74][75]. In 2015, Han et al prepared a full-color display in which the RGB QDs conversion layer was excited by a UV micro-LED array [71].…”

Section: Quantum Dot Color Conversion Ledsmentioning

confidence: 99%

Full-Color Realization of Micro-LED Displays

et al. 2020

Nanomaterials

140

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Emerging technologies, such as smart wearable devices, augmented reality (AR)/virtual reality (VR) displays, and naked-eye 3D projection, have gradually entered our lives, accompanied by an urgent market demand for high-end display technologies. Ultra-high-resolution displays, flexible displays, and transparent displays are all important types of future display technology, and traditional display technology cannot meet the relevant requirements. Micro-light-emitting diodes (micro-LEDs), which have the advantages of a high contrast, a short response time, a wide color gamut, low power consumption, and a long life, are expected to replace traditional liquid-crystal displays (LCD) and organic light-emitting diodes (OLED) screens and become the leaders in the next generation of display technology. However, there are two major obstacles to moving micro-LEDs from the laboratory to the commercial market. One is improving the yield rate and reducing the cost of the mass transfer of micro-LEDs, and the other is realizing a full-color display using micro-LED chips. This review will outline the three main methods for applying current micro-LED full-color displays, red, green, and blue (RGB) three-color micro-LED transfer technology, color conversion technology, and single-chip multi-color growth technology, to summarize present-day micro-LED full-color display technologies and help guide the follow-up research.

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“…Moreover, the solutionprocessed QDs can be easily integrated as the color-converting components by facile and standard fabrication techniques, e.g. spin-coating, drop-coating, or fiber-pulling methods for emerging components required in high-bit-rate communication channels, such as phosphor for microLEDs [22] and luminescent fibers for photodetection [4], [23].…”

Section: Introductionmentioning

confidence: 99%

Colloidal PbS Quantum Dots for Visible-to-Near-Infrared Optical Internet of Things

et al. 2021

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The emergence of optical Internet of Things (optical-IoT) for sixth-generation (6G) networks has been envisaged to relieve the bandwidth congestion in the conventional radio frequency (RF) channel, and to support the ever-increasing number of smart devices. Among the plethora of device innovations deemed essential for fortifying the development, herein we report on the visible-to-near-infrared colorconversion luminescent-dyes based on lead sulphide quantum dots (PbS QDs), so as to achieve an eyesafe high-speed optical link. The solution-processed PbS QDs exhibited strong absorption in the visible range, radiative recombination lifetime of 6.4 μs, as well as high photoluminescence quantum yield of up to 88%. Our proof-of-principle demonstration based on an orthogonal frequency-division multiplexing (OFDM) modulation scheme established an infrared data transmission of 0.27 Mbit/s, readily supporting an indoor optical-IoT system, and shed light on the possibility for PbS-integrated transceivers in supporting remote access control of multiple nodes. We further envisaged that our investigations could find applications in future development of solution-processable PbS-integrated luminescent fibers, concentrators, and waveguides for high-speed optical receivers.

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InGaN µLEDs integrated onto colloidal quantum dot functionalized ultra-thin glass

Cited by 12 publications

References 15 publications

Encapsulation-Enabled Perovskite–PMMA Films Combining a Micro-LED for High-Speed White-Light Communication

Encapsulation-Enabled Perovskite–PMMA Films Combining a Micro-LED for High-Speed White-Light Communication

Full-Color Realization of Micro-LED Displays

Colloidal PbS Quantum Dots for Visible-to-Near-Infrared Optical Internet of Things

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