Dear Adline,

Thanks for your research question. Indeed you can use white LEDs, since these LEDs mostly comprise a blue emitting (In,Ga)N semiconductor chip emitting between 440 and 480 nm and additional phosphors (Ce3+ doped garnets, Eu2+ doped silicates or nitrides) to obtain overall a white emission spectrum with high colour rendering. As your photocatalyst exhibts a band gap of 2.1 eV, which corresponds to 590 nm, such LEDs have plenty of radiation capable to excite your photocatalyst. So you can use them, but keep in mind, that a green to yellow emitting LED, with an emission peak just above the band gap of your photocat, might be even more efficient.

All the best with your research,

Thomas

Thank you @Thomas Jüstel. But what if halogen lamp is used?

Dear Adline Benila S ,

the emission spectrum of halogen lamps goes down to well below 590nm in the range to 450nm or even down to about 400nm.

Thus they will be useful for your task...

Have a look at the data sheet / spectrum of the halogen lamp, which you have in mind.

Best regards

G.M.