Energy Savings Forecast of Solid-State Lighting in General Illumination Applications

Conversionless efficient and broadband laser light diffusers for high brightness illumination applications

“…Its current power efficiency, i.e., the optical output power of the SSL device per unit input electrical power 2 , is~70% and there is no fundamental physical reason why efficiencies well beyond 70% could not be reached [2][3][4] . SSL is thus expected to replace all conventional light sources by 2035 5 , including halogen, xenon, incandescent, and fluorescent lamps 4,[6][7][8] . At present, light emitting diodes (LEDs) are the most efficient devices for white-light generation 2,3,6 .…”

“…At present, light emitting diodes (LEDs) are the most efficient devices for white-light generation 2,3,6 . Their adoption is predicted to achieve a 75% reduction of energy consumption for lighting by 2035 5 in the US alone, which would result in a total energy saving of 6.75 × 10 16 TJ (equivalent to nearly $630 billion in avoided energy costs) and thus drastically reduce greenhouse emission worldwide 5 . However, the so-called "efficiency droop" still limits the operation of LEDs to very low input power densities, with current densities~0.01 kA cm −2 2,9 .…”

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

“…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).…”

Improving LED Efficiency with the New Polymorph β‐Ca1−xSrxAlSiN3:Eu2+

“…The US department of energy estimates the energy savings due to Solid-State Lighting (SSL) technologyt ob eu pt o7 5% by 2035. [1] For general lighting applicationsa nd white-light sources, this commonly relates to the use of phosphor-converted white LEDs (pc-LEDs). In at ypical pc-LED ap rimary LEDchip emits blue light with high efficiency.T his blue light is then partially converted to longer wavelengths by mixtures of luminescent materials to obtain white light by additive colour mixing.T he colourq uality [e.g.,m easured by the colourr en-dering index (CRI)] and the luminous efficacy of radiation (LER) of theseL EDs are mainly defined by the mixture of luminescent materials used.…”