A Molecular Additive Enhances Next-Gen LEDs – But Shortens Their Lifespans By tinkering with the material makeup of perovskite LEDs, a cheaper and more easily made type of LED, Stanford researchers achieved leaps in brightness and efficiency – but saw their lights give out after a few minutes of us
Eight green perovskite LED substrates in Congreve’s lab glow as researchers shine ultraviolet light on them. Credit: Sebastian Fernández / Stanford UniversityBy tinkering with the material makeup of perovskite LEDs, a cheaper and more easily made type of LED, Stanford researchers achieved leaps in brightness and efficiency – but saw their lights give out after a few minutes of use.
Eight green manganese-doped perovskite LEDs in Congreve’s lab glow as researchers run an electric current through them. Credit: Sebastian Fernández / Stanford UniversityIn simplest terms, LEDs transform electrical energy into light by passing electric current through a semiconductor – layers of crystalline material that emits light with an applied electric field. But creating thosegets complex and costly compared to less energy-efficient lights like incandescents and fluorescents.
Most PeLEDs today, however, peter out after just a few hours. And they often don’t match the energy efficiency of standard LEDs, due to random gaps in the perovskite’s atomic structure known as defects. “There should be anhere, but there’s not,” Congreve explains. “Energy goes in there, but you don’t get light out, so it harms the overall efficiency of the device.
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