need some help about Optical electronics

Hi every one

I have a home work about Optic components and I have to write a report about one component I chose in addition to a small project using this optic component
I searched the net and I only found commercial websites.

Any one have a resources about such components like LDR , photo transistor ,opt coupler, IR LEDs...

Thank you All.

Go to the site https://alldatasheet.com/

search for
optocouplers :MCT2E
IR Sensors : TSOP 1738 (17.. in general)
IR LED : TSAL 68..

you may also make generic search at this site.

For introduction to TSOP1738 and sample application check out this link Lirc - Serial Port Receivers