What is OLED in Lighting?

OLED means Organic Light Emitting Diode.  It works in similar way than (semiconductor) LED. Both need positive and negative charge carriers to generate electrical current and finally generate light. It is a surface light source based on organic material layers. LED, on the other hand, is a point light source that is based on semiconductor materials. But…

CIE 1960 Chromaticity Diagram

Why the Same Color Temperatures Look Different?

We see more and more light sources that supposed to be exactly the same color temperature, but actually appear different to human eye. So why the same color temperatures look different? When people talk about color temperature, they are usually talking about correlated color temperature instead (CCT). There is a difference between these two. Color…

The history of LED – part 2

In my previous blog post, I wrote about the general development of the LED. Focus was in the development of LED component. How it was transformed from a laboratory experiment to a mass production of commercial product.  Different colors of LEDs were produced by applying different semiconductor layers on certain substrate materials. Still, there was…

What is LED?

LED – The replacement for every light source we possess? Thanks to the tightened regulations and more energy efficient approach, LED has started to replace all the traditional lighting. But what do those three letters hold inside? What actually IS LED? Literally, it is a light-emitting diode. Technically it is PN-junction. Functionally it is a…