The potential of III‐nitride laser diodes for solid‐state lighting

Abstract

The potential of III‐nitride based laser diodes (LDs) for solid‐state lighting (SSL) is discussed. State‐of‐the‐art blue LDs have higher efficiencies at high input power densities when compared to blue light‐emitting diodes (LEDs). This is because the processes that cause the drop in efficiency at high currents for LEDs are not present in the LD operated under stimulated emission. Projections of efficiency improvement show blue LDs have the potential to be nearly as efficient as blue LEDs and provide similar lumen output at much higher input powers. This result provides the possibility that white sources created from blue LD pumped phosphors could someday become a competitive and viable SSL source. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

III‐nitride quantum dots for ultra‐efficient solid‐state lighting

“…III‐nitride laser diodes (LDs) have also achieved impressive peak PCEs of ∼40% , and are gaining interest as an alternative source for SSL. They have many attributes that make them interesting for SSL including system and cost benefits and an ability for phosphor‐converted LDs (pc‐LDs) to produce white light with the same color rendering and color temperature as pc‐LEDs . Most interesting, in contrast to LEDs, LD operate under stimulated emission after lasing threshold, and parasitic recombination processes such as Auger are clamped at threshold.…”

Growth and development of Arabidopsis thaliana under single-wavelength red and blue laser light

“…1a ). Firstly, the input power density-to-optical light output of laser is higher than the current horticultural lighting because laser diodes (LDs) have much greater power conversion efficiency (PCE) than for example the LEDs especially at high current densities of ≥10 kWcm −2 25 26 . While the blue and red LEDs have PCEs of up to 60 and 40% respectively 27 , they incur a drastic loss of PCE at input power density of ≥1 kWcm −2 26 .…”

Phosphorous Diffuser Diverged Blue Laser Diode for Indoor Lighting and Communication

“…In 2013, Wierer et al have compared the economics and input-power-density dependent power-conversion efficiencies between blue LEDs and LDs based Li-Fi systems36. Moreover, the potential of III-nitride LD based lighting was also emerged by the same group, which declares the higher efficiency of blue LDs than that of blue LEDs at larger input power densities37. To implement the white-lighting system, a high-luminescent white-light source with a luminance as high as 85 cd/mm 2 by combining a high-power blue LD, an optical fiber and a phosphor was developed by Kozaki et al 38.…”