Minimising efficiency roll-off in high-brightness perovskite light-emitting diodes

Graded-host phosphorescent light-emitting diodes with high efficiency and reduced roll-off

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Overcoming the electroluminescence efficiency limitations of perovskite light-emitting diodes.

Organic-inorganic hybrid perovskites are emerging low-cost emitters with very high color purity, but their low luminescent efficiency is a critical drawback. We boosted the current efficiency (CE) of perovskite light-emitting diodes with a simple bilayer structure to 42.9 candela per ampere, similar to the CE of phosphorescent organic light-emitting diodes, with two modifications: We prevented ...

High Efficiency SEPIC Converter For High Brightness Light Emitting Diodes (LEDs) System

High brightness formamidinium lead bromide perovskite nanocrystal light emitting devices

Formamidinium lead halide (FAPbX3) has attracted greater attention and is more prominent recently in photovoltaic devices due to its broad absorption and higher thermal stability in comparison to more popular methylammonium lead halide MAPbX3. Herein, a simple and highly reproducible room temperature synthesis of device grade high quality formamidinium lead bromide CH(NH2)2PbBr3 (FAPbBr3) collo...

Defect related issues in the "current roll-off" in InGaN based light emitting diodes