Q. What is the origin of LED?
A.In 1907, British radio engineer, Henry Joseph Round, investigated electrical properties of metal-semiconductor silicon carbide (SiC) rectifier
as a replacement for vacuum diodes, and discovered the emission of light from solids.
Although Henry Joseph Round published a paper on this electroluminescence phenonium in the Electrical World journal, it went unnoticed.
Since then, LEDs have been studied and researched with the intent of generating and extracting many photons.
Furthermore, since the color of light in LEDs vary depending on the difference in compound energy,
research was also conducted regarding which compounds (and how) can be utilized to combine them.
In 1962, Nick Holoniak Jr. succeeded in developing a red-light emitting diode
and was acknowledged to be the first practical lighting emitting device.
Entering the 1980s, research on AlGaInP compound semiconductors as a highly efficient
light emitting device in a long wavelength region of red to yellow was conducted
and is still being studied to this present day.
Research on light emitting devices in short wavelengths across a
region of visible blue to purple light began in the late 1960s.
In the early 1990s, blue LEDs utilizing GaN-based materials were
successfully developed. Based on this, green LEDs were also developed,
as long with today’s white LEDs.
Q. Eco-friendly LED product? Does such a thing exist?
A.LED products are incredibly efficient.
It makes for an environmentally friendly product due to its low power consumption
and long product life expectancy. Additionally, LED products do not contain mercury (Hg),
an environmentally regulated substance, essentially not producing any carbon dioxide.
Q. What exactly is a LED?
A.LED (Light Emitting Diode) is a semiconductor device that emits light when forward voltage is applied.
Because it does not use a filament like a lightbulb, it is compact, resistant to vibration, and has a long lifespan.
Materials used to compose LED products can express various colors (depending on aforementioned materials).
Since light does not contain ultraviolet or infrared rays, it is often used for lighting works of art and
cultural properties sensitive to lighting.
Response to input voltage is so fast, it is also utilized as a mean of communication, and when used as lighting,
maximum intensity of light can be achieved as soon as it is turned on.