Fig. 6: Structure and performance characterization of LEDs. | Nature Communications

Fig. 6: Structure and performance characterization of LEDs.

From: Onion-like multicolor thermally activated delayed fluorescent carbon quantum dots for efficient electroluminescent light-emitting diodes

Fig. 6

a Device structure (ITO: Indium tin oxide, PEDOT:PSS: poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate), PVK: poly(N-vinyl carbazole), OLM-TADF-CQDs: onion-like multicolor thermally activated delayed fluorescence carbon quantum dots, TPBi: 1,3,5-tris(N-phenylbenzimidazol-2-yl) benzene). b Energy level diagram. c Cross-sectional TEM image (scale bar: 50 nm). d–h Electroluminescence (EL) and photoluminescence (PL) spectra of the LEDs at different bias voltages (insets are photographs of the operation of the LEDs). i Current density–voltage–luminance (J–V–L) characteristics of LEDs. j External quantum efficiency (EQE)–V characteristics of LEDs. k Stability plot of LEDs.

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