59.1: Invited Paper: On the Recent Progress of LED Lighting in Japan

Abstract

The widespread introduction of LED lighting is expected to reduce greenhouse gas emissions because white LEDs will be the most efficient light sources in the near future. This paper describes trends in emission of greenhouse gases in Japan and compares the CO 2 emission of LED lighting with conventional lighting.[3] Japan Electric Lamp Manufacturers Association,

Uncovering the carrier dynamics of AlInGaN semiconductors using time-resolved cathodoluminescence

“…Stacking faults are two-dimensional defects which exist because of a partial displacement that affects the regular lattice stacking sequence. In wz III-nitrides, stacking faults that lie along the basal (0001) planes are basal stacking faults while those that lie along the prismatic planes such as (11)(12)(13)(14)(15)(16)(17)(18)(19)(20) are prismatic stacking faults.…”

“…Metzner et al [70] explored InGaN QWs grown on the side facets of single pyramid GaN nanostructures with a hexagonal base as shown in Figure 8(a). The single pyramids were grown by MOVPE using self-assembly and showed six (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) facets. Using CL mapping, the peak InGaN QW emission energy was found to blueshift from the top (2.1 eV) of the pyramid to the base (2.25 eV) of the pyramid.…”

“…The importance of considering defect-related recombination was shown by Corfdir et al [81]. The authors investigated InGaN QWs grown on (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) side facets of triangular prism shaped GaN structures. From the peak CL wavelength map in Figure 9(a), the authors observe a shift in the InGaN QW emission energy from 3.4 eV near the base of the prism to 3.05 eV at the top.…”

“…Compared to these traditional light sources, LEDs provide improved energy efficiencies, reduced device footprints, longer device lifetimes, and are easily scalable [6][7][8][9][10][11]. Importantly, by replacing traditional lighting sources, the power-saving nature of InGaN-based white LEDs can not only reduce global carbon emissions, helping to fight climate change, but can also allow people in remote areas access to ambient lighting [12,13]. Apart from LEDs, InGaN has also been crucial in the advancement of other optoelectronic technology including laser diodes (LDs), photovoltaics and photodetectors [14][15][16].…”

Phototherapy and the benefits of LEDs

“…The major applications of LEDs are for LCD backlights and solid-state light sources. 10 There is a different application of LEDs other than for backlights or lamps. Recently, LED light therapy has drawn much attention because it is very effective in healing diseases without pain, it is non-invasive, and cost effective.…”