The electrical and optical properties of tandem organic light-emitting diodes (OLEDs). in which a fluorescent and phosphorescent emitting units are connected by an organic charge-generation layer (CGL). were experimentally analyzed. To investigate the internal properties of the tandem OLEDs. https://www.jmannino.com/deal-time-bio365-BIOLITE-Soil-Grow-Bags-2-Gallons-great-save/