Extended Data Fig. 6: Electroluminescence vs hBN’s incandescence.
From: Electroluminescence and energy transfer mediated by hyperbolic polaritons
Comparison between the IR-SMS spectral flux of TR1 under electrical bias (red curve) and its incandescence when heated via a hot plate to the temperature of hBN’s optical phonons (~75 °C, green curve). This comparison reveals that the main polariton peak at ~190 meV, which is involved in the electroluminescence process, is notably absent from the thermal emission spectrum (green curve). Thus, incandescence from hBN’s optical phonons can be dismissed as the origin of the mid-IR signal.
