i need a led number

hi everybody iam mohd qaisi:
i want to make a final year project which it is infrared net based touch screen ,so i dont have any number for sender and reciever ,so if any body know numbe of thiese led give me please ,this led must transmit waves minimum to 20 cm .
so reciever must recieve for 20 cm long .

Pretty much any IR LED will go 20 cm if you give it a suitable current pulse. I would concentrate on parts you can obtain in your part of the world.

thanks

thanks mr Papabravo for ur reply .