There is a new member of LD131 seriers which name is LD1317,you can find it on
seekic .it's features could be summariesd as follows:(1) operating characteristics:ta=25 centigrade (2) VF Forward Votage(TYP): IF=20mA,Red=1.6; (3) VF Forward Votage(MAX): IF=20mA,Red=2.0; (4)IR Reverse Current: VR=5V,100/VR=3V; (5) Wave Length at Peak Emission: IF=20mA; (6) Spectral Line Half-Width: IF=20mA Red=40;
The absolute maximum ratings is

1) Reverse Voltage: VR RED=3; (2) Average Forward Current: IAF Red=50; (3) Peak Forward Current(Duty1/10,1KHZ): IPF Red=200; (4) Power: pd Red=120; (5) Derating Linear From 25 centigrade:Red=0.8.