Fig. 4: Mass spectrometric analysis of an aged OLED device for Emitter 3.
From: Critical role of electrons in the short lifetime of blue OLEDs
a Energy profiles for various degradation reactions of Emitter 3. b Primary degradation products of Emitter 3 produced along each reaction path and their mass values. c Relative intensities of the mass peaks of P1–P4 in (b). d Mass spectrum of the degradation products in the EML of the aged device whose luminance dropped to 10% of the initial value. Each red peak corresponds to the secondary degradation products formed by the primary products in (b) with a host molecule. The mass-to-charge ratio (m/z) is written in atomic mass units.
