Fig. 2

Photoluminescence (PL) and magneto-PL for cavity-based OLEDs. a Narrow PL spectra for cavity-based OLEDs with different Q-factors under CW 405 nm laser excitation. b Magneto-PL for cavity-based OLEDs with different Q-factors and F8BT thin film at excitation intensity of 1000 mW cm⁻²