How to model IR LED Diode in SPICE [duplicate]

How does one model an IR diode in SPICE? Specifically, the TIL38.

Datasheet here: http://www.supermoduul.com/PDF/TIL38.pdf

I get it that Is needs to be found - is this the same as If in the datasheet?

The diode apparently seems to work in reverse-bias mode.

marked as duplicate by W5VO♦Mar 21 '14 at 15:30

No, the specified $I_F$ is not the same as $I_S$. Also, this is an LED so it is usually used in the forward-bias mode rather than in reverse bias (like a photodiode detector).
There isn't much information on the data sheet that could be used to create a SPICE model. You have two points on the I/V relationship under forward bias: the forward voltage $V_F$ at 100 mA and at 1 A of forward current. You could create a piece-wise linear model to fit these points using a voltage source and an ideal resistor. Depending on what sort of simulations you intend to run, that might be enough.