For a photoelectric device to operate, the condition that must be satisfied is that the energy of the incident light should be greater than or equal to the work function of the material used in the fabrication of the device.
Considering standard table;
When using violet light with incident energy, \(E_1=3.19\;\mathit{eV}\) , the photosensitive materials could besodium \((\mathit{Na})\) having work function \(\phi_o=3.75\;\mathit{eV}\) , potassium \((K)\) having work function \(\phi _o=2.30\;\mathit{eV}\) and cesium \((\mathit{Cs})\) having work function \(\phi _o=2.14\;\mathit{eV}\)
When using yellow-green light with incident energy, \(E_2=2.26\;\mathit{eV}\) , the photosensitive material could be cesium \((\mathit{Cs})\) having work function \(\phi _o=2.14\;\mathit{eV}\) .
When using red light with incident energy, \(E_3=1.64\;\mathit{eV}\) , none of these photosensitive material could be used since the required condition does not satisfy.