These are the specs on my IR LED:

Code:
Parameter                   min    typ    max   unit     test conditions
---------------------------------------------------------------------------------
radiant power               14     -      28    mW/cd2   If=20mA
peak emission wavelength    -      -      940   nm       If=20mA
spectral line half width    -      -      50    nm       If=20mA
forward voltage             -      1.2    2.0   V        If=20mA
reverse current             -      -      100   uA       Vr=5V
rise time                   -      -      200   nS       PW=10uS DC=10% Ifp=20mA
fall time                   -      -      500   nS       PW=10uS DC=10% Ifp=20mA
power dissipation           -      -      150   mW       Vr=5V
continous forward current   -      -      50    mA       -
peak forward current        -      -      1     A        PW=10uS DC=10% Ifp=20mA
reverse voltage             -      -      5     V        -
viewing angle               -      20     -     deg      -
operating temp range        -45    +25    +100  degC     -
storage remp range          -45    +25    +100  degC     -
lead soldering temp         -      -      +250  degC     5 Sec 1.6mm from base

PW=Pulse Width
DC=Duty Cycle
The frequency of 48khz i found by trial and error. It def works best at 48khz.

How could i get 700mA with this LED? Pref with 5v only?