Abstract
You might be reading the article on a computer screen or on a book. On both the cases, light is required, be it the light on screen or the light required for reading. You might go to a supermarket and now you may not need to stay in large ques, thanks to the modern laser scanners and barcode readers. You might be browsing the internet, Thanks to the fibre amplifier in optical cables. When you think of hybrid phosphor materials in daily life, you will be able to see many devices helping you directly or indirectly in many ways. This chapter gives a short insight into the Luminescent thin films, Polymer optical amplifiers and LEDs.