2019 Lighting R&amp;D Opportunities

Pattison, Morgan; Hansen, Monica; Bardsley, Norman; Elliott, Clay; Lee, Kyung Hwa; Pattison, Lisa; Tsao, Jeffrey Y.

doi:10.2172/1618035

Cited by 32 publications

(47 citation statements)

References 16 publications

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“…This corresponds to operation at very high currents of order 100 A/cm 2 , and, concomitantly, the efficiency becomes limited by many-body quenching effects (e.g. Auger recombination, generally believed to cause droop) in the active region [332]. Also, conversion of blue to white light by remote phosphors -for consumers visible as the yellow diffusing material covering the LED module itself -is associated with huge challenges: complete absorption of very large input optical powers typically requires thick phosphors and is associated intrinsically with the 1 eV/photon energy difference between absorbed (blue) and emitted (green to red) photons, with large dissipation in the material.…”

Section: Prospective Applications 621 Solid-state Lightingmentioning

confidence: 99%

Light-emitting metasurfaces

et al. 2019

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Photonic metasurfaces, that is, two-dimensional arrangements of designed plasmonic or dielectric resonant scatterers, have been established as a successful concept for controlling light fields at the nanoscale. While the majority of research so far has concentrated on passive metasurfaces, the direct integration of nanoscale emitters into the metasurface architecture offers unique opportunities ranging from fundamental investigations of complex light-matter interactions to the creation of flat sources of tailored light fields. While the integration of emitters in metasurfaces as well as many fundamental effects occurring in such structures were initially studied in the realm of nanoplasmonics, the field has recently gained significant momentum following the development of Mie-resonant dielectric metasurfaces. Because of their low absorption losses, additional possibilities for emitter integration, and compatibility with semiconductor-based light-emitting devices, all-dielectric systems are promising for highly efficient metasurface light sources. Furthermore, a flurry of new emission phenomena are expected based on their multipolar resonant response. This review reports on the state of the art of light-emitting metasurfaces, covering both plasmonic and all-dielectric systems.

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Section: Prospective Applications 621 Solid-state Lightingmentioning

confidence: 99%

Light-emitting metasurfaces

et al. 2019

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“…Reactions were run under N2 atmosphere using standard Schlenk techniques and detailed synthesis procedures are described below. Theo8 [1] and 4,9-dibromonaphtho[2,3c][1,2,5]selenadiazole [2] were prepared according to literature procedures. NMR was taken with Bruker 500 MHz spectrometer.…”

Section: Synthesis Of Theo-rubymentioning

confidence: 99%

“…NMR was taken with Bruker 500 MHz spectrometer. [1,2,5]thiadiazole (1,194 mg, 3 mmol), pivalic acid (80 mg, 0.8 mmol) and dried Cs2CO3 (3 g, 9 mmol) were added into a 50 mL round bottom flask. 25 mL o-xylene was then added into the flask, followed by degassing with N2 flow for 10 min.…”

Section: Synthesis Of Theo-rubymentioning

confidence: 99%

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Naturally Derived Organic Dyes for LED Lightings of High Color Rendering and Fidelity Index

Huang

Cohen

Luscombe

2021

Advanced Sustainable Systems

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Light-emitting diodes (LEDs) are a lighting technology with a huge and ascending market. Typically, LED backlights are often paired with inorganic phosphors made from rare-earth elements (REEs) to tune the emission lineshapes for different applications. However, REE production is a resource-intensive process with many negative environmental impacts. Herein we develop organic hybrid LEDs using organic dyes synthesized from an abundant and non-toxic natural product (theobromine) to replace REE phosphors. The resulting hybrid LED generates continuous emission from 400 -740 nm, resulting in high color rendering index (the current industry standard) of 90 and color fidelity index (the most advanced and comprehensive standard) of 92, challenging commercial LEDs based on REE phosphors. In addition, the light-converting composite is made from 99 wt% SBS, an inexpensive industrial polymer, and 1wt% theobromine dyes, reducing the cost of the light converter to ¢1.30 for a 1 W LED, compared to approximately ¢ 19.2 of commercial products. The light converting efficiency of the dye-SBS composite is 82%. Excited state kinetics experiments were also conducted to provide guidance to further increase the light-converting efficiency of the theobromine dyes while maintaining excellent color rendering and fidelity. File list (2) download file view on ChemRxiv Supporting Information.pdf (610.92 KiB) download file view on ChemRxiv Theobromine and CRI CFI.pdf (1.00 MiB)

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“…LED (light-emitting diode) is a semiconductor electroluminescent device that has defined the electromagnetic spectrum available with high brightness very used in lamps to the production of white emission and promoting energy consumption economy [1][2][3] . In the lighting market, there are some types of LEDs with different advantages and applications.…”

Section: Introductionmentioning

confidence: 99%

Influence of temperature in the performance of the LED lamp

Santos¹,

Burini²,

Hui³

2020

RBAV

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In this work, we analyze the temperature of the LED lamp of white emission with 9 W with or without the influence of the cooling process using a fan. The investigation was carried out by seven different methods: (1) Analysis of temperature close to LEDs inside the bulb (diffuser); (2) Analysis of temperature on LEDs without bulb; (3) Analysis of temperature on LEDs without bulb with cooling using a fan; (4) Analysis of temperature on LEDs board out of body lamp without bulb; (5) Analysis of temperature on LEDs board out of body lamp without bulb with cooling using a fan. This last analysis 5 exhibited better results, decreasing the significant temperature on the LED surface from ≈130ºC (found in analysis 2) to ≈45ºC. Due to good results exhibited in analysis 5, it was used in the illuminance measurements of the LED lamp without cooling in the analysis 6, and with a fan as analysis 7. Both results compared showed that using a fan had a great influence, and difference on the illuminance values by elapsed time from ≈47,000 lux without a fan (analysis 6) to ≈55,300 lux with fan (analysis 7), and also the use of a fan exhibited the lowest time of stabilization in 1 minute only.

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2019 Lighting R&D Opportunities

Cited by 32 publications

References 16 publications

Light-emitting metasurfaces

Light-emitting metasurfaces

Naturally Derived Organic Dyes for LED Lightings of High Color Rendering and Fidelity Index

Influence of temperature in the performance of the LED lamp

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