Film over an SMD LED to change its colour?
Unless you investigate fluorescence, you can't get any colour out of a filter if it isn't already in the source. If the colour is off that much then you're going to need a lot of filtering to remove the deep red portion of the band that you've got and you won't be left with much light.
It's not clear from your question whether you need three different LEDs or one colour at a time. If the latter then your colour could be obtained by blending the RGB.