About spectrum width of infrared emitters and LEDs

[belax]

I have few questions related to IR emitters and general LEDs too.

Let’s take for example IR emitter TSHF5210, produced by Vishay.
(Just in case, I attached datasheet to the post). This IR emitter has spectral peak of its emission at 890 nm.

1) Why does it have such a wide spectral width (about 75 nm)?
2) Why can’t it have narrower width, let’s say 10 nm?
3) As I understand this spectral-plot was obtained during constant current flowing through the IR emitter. Will the output spectral-plot of the IR emitter be the same for very short impulse (e.g. 70 ns)? If not, how will it be different?

I am asking all these questions, because in some applications I need narrow spectral-band. Diode-Lasers do have a narrow spectrum, but they also do have a heavy price? I am wondering, if by means of fast switching, the IR emitter will have a narrower bandwidth or the bandwidth will have spikier shape?

Thank you.

 

[ark5230]

No that is not possible. It is the characteristics of the materials used and the working conditions. You may resort to a cheap laser diode like arrangement, else use a optical filter in front of the souce with bandwidth. Please note narrower is the filter width that lower will be the available power.

 

[belax]

About laser diodes I understand.
I just wanted to consider to use IR emitters (not Laser ones) in ND:YAG rod side-pumping scheme . But it seems will be very low efficient solution, because of the broad-bend spectrum.

Thank you.

 

[ark5230]

Please check this link you find IR diodes with less than 1 nm bandwidth
**broken link removed**
Regards
Raoof