Fig. 4: Operational stability tests of QD-LEDs using TFB and TFB:CBPV as HTLs.
From: Efficient and stable near-infrared InAs quantum dot light-emitting diodes
a Operational half-lifetime (T50) measurements of QD-LEDs based on TFB (light coral) and crosslinked TFB:CBP (sky blue) HTLs. The measurements were performed at constant driving current densities, corresponding to an initial radiance of 50 W sr−1 m−2. Electrical pump transient absorption (ETA) spectra of QD-LEDs using TFB (b) and photo-crosslinked TFB:CBPV (c) as HTLs, respectively, before (solid line) and after degradation (dash line). The degradation of QD-LEDs was accelerated under a constant driving voltage of 5 V. During these degradation assessments, TFB-based QD-LED exhibited a ~50% decrease in the radiance (R0 = 100 W sr−1 m−2), while TFB:CBPV-based QD-LED exhibited a ~20% decrease (R0 = 125 W sr−1 m−2). ETA characterization conditions: voltage, −5 V; frequency, 1 kHz; electric pulse width, 10 µs; white light probing frequency, 2 kHz.
