Solution-state assembly of intrinsic broadband white-light emitters

Stanford researchers have disclosed a new family of white light emitting perovskites with photoluminescence quantum efficiencies (PLQEs) of up to 9%, which show stable emission over at least three months of continuous irradiation. Upon near-ultraviolet excitation, two new Pb–Cl and Pb–Br perovskites emit broadband 'cold' and 'warm' white light, respectively, with high color rendition. Emission from large, single crystals indicates an origin from the bulk material and not surface defect sites. This work builds upon earlier research describing white-light emitting layered hybrid perovskites. Broadband emission from these materials displayed high color rendition, tunable chromaticity coordinates, and undiminished activity under continuous irradiation for a week. These materials have many promising attributes as phosphors including room-temperature synthesis, solution-state film deposition methods that do not require binding agents, high color rendition, tunable chromaticity, and sustained long-term performance.

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Stage of Research