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• W3048826563 abstract "All-inorganic cesium lead bromide ( <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=m1> <mml:mrow> <mml:msub> <mml:mi>CsPbBr</mml:mi> <mml:mn>3</mml:mn> </mml:msub> </mml:mrow> </mml:math> ) perovskite quantum dots (QDs) with excellent optical properties have been regarded as good gain materials for amplified spontaneous emission (ASE). However, the poor stability as the results of the high sensitivity to heat and moisture limits their further applications. Here, we report a facile one-pot approach to synthesize <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=m2> <mml:mrow> <mml:msub> <mml:mi>CsPbBr</mml:mi> <mml:mn>3</mml:mn> </mml:msub> <mml:mo>@</mml:mo> <mml:msub> <mml:mi>SiO</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:mrow> </mml:math> QDs at room temperature. Due to the effective defects passivation using <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=m3> <mml:mrow> <mml:msub> <mml:mi>SiO</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:mrow> </mml:math> , as-prepared <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=m4> <mml:mrow> <mml:msub> <mml:mi>CsPbBr</mml:mi> <mml:mn>3</mml:mn> </mml:msub> <mml:mo>@</mml:mo> <mml:msub> <mml:mi>SiO</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:mrow> </mml:math> QDs present an enhanced photoluminescence quantum yield (PLQY) and chemical stability. The PLQY of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=m5> <mml:mrow> <mml:msub> <mml:mi>CsPbBr</mml:mi> <mml:mn>3</mml:mn> </mml:msub> <mml:mo>@</mml:mo> <mml:msub> <mml:mi>SiO</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:mrow> </mml:math> QDs reaches 71.6% which is higher than 46% in pure <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=m6> <mml:mrow> <mml:msub> <mml:mi>CsPbBr</mml:mi> <mml:mn>3</mml:mn> </mml:msub> </mml:mrow> </mml:math> QDs. The PL intensity of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=m7> <mml:mrow> <mml:msub> <mml:mi>CsPbBr</mml:mi> <mml:mn>3</mml:mn> </mml:msub> <mml:mo>@</mml:mo> <mml:msub> <mml:mi>SiO</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:mrow> </mml:math> QDs maintains 84% while remaining 24% in pure <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=m8> <mml:mrow> <mml:msub> <mml:mi>CsPbBr</mml:mi> <mml:mn>3</mml:mn> </mml:msub> </mml:mrow> </mml:math> after 80 min heating at 60°C. The ASE performance of the films is also studied under a two-photon-pumped laser. Compared with the films using pure <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=m9> <mml:mrow> <mml:msub> <mml:mi>CsPbBr</mml:mi> <mml:mn>3</mml:mn> </mml:msub> </mml:mrow> </mml:math> QDs, those with as-prepared <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=m10> <mml:mrow> <mml:msub> <mml:mi>CsPbBr</mml:mi> <mml:mn>3</mml:mn> </mml:msub> <mml:mo>@</mml:mo> <mml:msub> <mml:mi>SiO</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:mrow> </mml:math> QDs exhibit a reduced threshold of ASE. The work suggests that room-temperature-synthesized <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=m11> <mml:mrow> <mml:msub> <mml:mi>SiO</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:mrow> </mml:math> -coated perovskites QDs are promising candidates for laser devices." @default.
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• W3048826563 date "2020-09-22" @default.
• W3048826563 modified "2023-10-17" @default.
• W3048826563 title "Room temperature synthesis of stable silica-coated CsPbBr₃ quantum dots for amplified spontaneous emission" @default.
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• W3048826563 doi "https://doi.org/10.1364/prj.399845" @default.
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