Study of energy gaps and their temperature-dependent modulation in LaCrO3: A theoretical and experimental approach

In the present study, origin of three energy gaps lanthanum chromium oxide, one arises due to charge-transfer gap between O-2p and Cr-3d two from d–d transitions, is analyzed in detail using diffuse reflectance spectroscopy technique. The spin allowed such as 4T1(P)→4A2, 4T1(F)→4A2, 4T2→4A2, parity forbidden 2E →4A2 transitions are depicted a Tanabe–Sugano (T–S) diagram an absorption spectrum. high crystal field strength 3.27 obtained T–S provides directional emission makes system suitable for near infrared lasing applications. Moreover, investigations into variation with temperature will provide insights modification numerous optical properties toward development optoelectronic devices. Using this temperature-dependent studies, we have important parameters, Urbach (Eu) focus. Furthermore, first-principles calculations carried out order validate experimental findings on LaCrO3. results consonance theoretical calculations. bandgap fitted Varshni's relation, Debye calculated.