Abstract
Perovskite quantum dots (QDs) have been widely used in white light-emitting diodes (WLEDs), due to their high quantum yield (QY), tunable bandgap, and simple preparation. However, the red-emitting perovskite QDs are usually containing iodine (I), which is not stable under continuous light irradiation. Herein, perovskite-based WLED is fabricated by lead-free bismuth (Bi)-doped inorganic perovskites Cs2SnCl6 and less-lead Mn-doped CsPbCl3 QDs, which emits white light with color coordinates of (0.334, 0.297). The Bi-doped Cs2SnCl6 and Mn-doped CsPbCl3 QDs both show excellent stability when kept in the ambient air. As benefits from this desired characteristic, the as-prepared WLED shows excellent stability along with operating time. These results can promote the application of inorganic perovskite QDs in the field of WLEDs.
Highlights
Among solid-state lighting technology, white light-emitting diodes (WLEDs) are excellent candidates to replace incandescent lamps for their merits of high-energy conservation, long lifetime, high luminous efficiency, and polarized emissions [1]
We introduce Mn-doped CsPbCl3 quantum dots (QDs) and Bi-doped Cs2SnCl6 as the orange emission light and blue emission light to fabricate high-performance WLEDs
Bi-doped Cs2SnCl6 perovskite was synthesized according to the previous approach with little modification [33]
Summary
Among solid-state lighting technology, white light-emitting diodes (WLEDs) are excellent candidates to replace incandescent lamps for their merits of high-energy conservation, long lifetime, high luminous efficiency, and polarized emissions [1]. WLEDs were recognized as one kind of the economical and efficient solid-state lighting sources [2, 3]. Perovskites have attracted much attention, and they have been applied in many different fields [5–15]. Perovskite solar cells with power conversion efficiency (PCE) exceeding 23% have been achieved because of their excellent absorption (Abs) coefficients, long carrier diffusion lengths, and high carrier mobilities [5–7]. CsPbBr3-encapsulated PbSe wires have shown good optoelectronic performance including high responsivity (~ 104 A W−1) and fair response speed (~ ms), demonstrating their great potential application in photodetection fields [8–10]. The remarkable features of perovskite, Liu et al Nanoscale Research Letters (2019) 14:152
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