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Blue light, a type of high-energy light, is part of the visible light spectrum. High-energy visible light (HEV light) is short-wave light in the violet/blue band from 400 to 450 nm in the visible spectrum, which in artificial narrowband form has a number of proven negative biological effects, namely on circadian rhythm and retinal health (blue-light hazard), which can lead to age-related ...
In the early 1990s, Shuji Nakamura, Hiroshi Amano and Isamu Akasaki invented blue light-emitting diodes that were dramatically more efficient than their predecessors, bringing a new generation of bright, energy-efficient white lighting and full-color LED displays into practical use and winning the 2014 Nobel Prize in Physics. [11] [12]
A blue laser emits electromagnetic radiation with a wavelength between 400 and 500 nanometers, which the human eye sees in the visible spectrum as blue or violet. [1] Blue lasers can be produced by: direct, inorganic diode semiconductor lasers based on quantum wells of gallium(III) nitride at 380-417nm [2] [3] or indium gallium nitride at 450 nm
Isamu Akasaki (赤﨑 勇, Akasaki Isamu, January 30, 1929 – April 1, 2021) was a Japanese engineer and physicist, specializing in the field of semiconductor technology and Nobel Prize laureate, best known for inventing the bright gallium nitride p-n junction blue LED in 1989 and subsequently the high-brightness GaN blue LED as well.
Recently, [when?] blue-, red-, and green-emitting thin film electroluminescent materials that offer the potential for long life and full-color electroluminescent displays have been developed. The EL material must be enclosed between two electrodes and at least one electrode must be transparent to allow the escape of the produced light.
Shuji Nakamura (中村 修二, Nakamura Shūji, born May 22, 1954) is a Japanese-American electronic engineer and inventor of the blue LED, a major breakthrough in lighting technology. [3]
A superluminescent diode (SLED or SLD) is an edge-emitting semiconductor light source based on superluminescence. It combines the high power and brightness of laser diodes with the low coherence of conventional light-emitting diodes. Its emission optical bandwidth, also described as full-width at half maximum, can range from 5 up to 750 nm. [1]
More recently, outside the education sector, calculator applications on mobile phones have for many replaced the pocket calculator, and there is progression from LED backlit LCDs back to full LED displays in the form of Organic Light Emitting Diode (OLED) displays. The first VFD was the single indication DM160 by Philips in 1959.