Solid-State Lighting R&D Plan - 2015

Cool to warm white light emission from hybrid inorganic/organic light-emitting diodes

“…22 For (TPA-Flu) 2 BTBT, the highest blue-to-white efficacy for the data points in Fig. 6, which lie in the cool to warm white region, is 116 lm W À1 .…”

Eu3+‐doped glass as a color rendering index enhancer in phosphor‐in‐glass

“…24 In the strategic plan of the US Department of Energy for 2020, a down-converter material with a FWHM of 30 nm is sought. 25 CASN:Eu 2+ and other generally used red phosphors such as SrS:Eu 2+ and Sr 2 Si 5 N 8 :Eu 2+ exhibit a FWHM wider than 50 nm. 24 Also, maximum peak of light emission with a wavelength beyond 650 nm (CASN:Eu 2+ ) is poorly perceived by the human eye and constitute a great loss in luminous efficacy.…”

“…It is known that a broad‐band yellow or green phosphor combined with a narrow band red phosphor can improve the CRI of white light devices . In the strategic plan of the US Department of Energy for 2020, a down‐converter material with a FWHM of 30 nm is sought . CASN:Eu 2+ and other generally used red phosphors such as SrS:Eu 2+ and Sr 2 Si 5 N 8 :Eu 2+ exhibit a FWHM wider than 50 nm .…”

Economic feasibility of recycling rare earth oxides from end-of-life lighting technologies

“…Transition from incandescent light bulbs to fluorescent lamps (FLs), including compact fluorescent lamps (CFLs) and linear fluorescent lamps (LFLs), started in the 1990s, thanks to their high energy efficiency, long lifetime, affordable prices, and the worldwide phase-out of incandescent light bulbs (Waide 2010;UNEP 2012). Globally, FLs accounted for 60% of newly installed lamps in 2015 (Bardsley et al 2015). In recent years, as light-emitting diodes (LEDs) have become affordable enough for general lighting, LEDs are expected to replace FLs and become the dominant lighting technology (Penning et al 2016;Bardsley et al 2015;Lim et al 2011).…”

“…Globally, FLs accounted for 60% of newly installed lamps in 2015 (Bardsley et al 2015). In recent years, as light-emitting diodes (LEDs) have become affordable enough for general lighting, LEDs are expected to replace FLs and become the dominant lighting technology (Penning et al 2016;Bardsley et al 2015;Lim et al 2011). Compared to incandescent light bulbs, FLs usually have higher luminous efficacy of 60 to 95 lm/W, and longer lifetime of 8,000 to 10,000 hours, and LEDs even show better performance compared to FLs, with the luminous efficacy of 90 to 120 lm/W and lifetime over 15,000 hours (Waide 2010;UNEP 2017).…”