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Engineering the Photoluminescence of CsPbX3 (X = Cl, Br, and I) Perovskite Nanocrystals Across the Full Visible Spectra with the Interval of 1 nm
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-03-29 00:00:00 , DOI: 10.1021/acsami.9b01930 Huiwen Liu 1 , Zhaoyu Liu 1 , Wenzhe Xu 1 , Liting Yang 1 , Yi Liu 1 , Dong Yao 1 , Daqi Zhang 2 , Hao Zhang 1 , Bai Yang 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-03-29 00:00:00 , DOI: 10.1021/acsami.9b01930 Huiwen Liu 1 , Zhaoyu Liu 1 , Wenzhe Xu 1 , Liting Yang 1 , Yi Liu 1 , Dong Yao 1 , Daqi Zhang 2 , Hao Zhang 1 , Bai Yang 1
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Fluorescent CsPbX3 (X = Cl, Br, I) perovskite nanocrystals (NCs) are compelling candidates for illumination and display applications because of the high photoluminescence quantum yields (PLQYs) narrow PL emission spectra, and in particular, the potential to tune the emission spectra in the entire visible range. However, limited by the current preparation strategy, the successive adjustment of PL emission across the full visible spectral range with very small interval, like conventional semiconductor quantum dots, is still challenging. In this work, we demonstrate the capability to tune the PL emission of CsPbX3 NCs in the full visible range with the interval of 1 nm on the basis of a modified anion-exchange route. Highly luminescent CsPbCl3 NCs with PLQY up to 34.2% are foremost prepared using alkanoyl chlorides as the chlorine source and further employed to perform anion exchange. A successive and accurate adjustment of the PL emission is achieved with the addition of ZnX2 (X = Br and I) aqueous solution and assisted by ultrasound to improve the reactivity of halogens in the anion exchange. Besides the accurately tunable PL emission position, the as-prepared CsPbX3 NCs exhibit good phase/chemical stability, high PLQY, and narrow PL emission spectra.
中文翻译：
跨全可见光谱以1 nm的间隔工程化CsPbX 3（X = Cl，Br和I）钙钛矿纳米晶体的光致发光
萤光CsPbX 3（X = Cl，Br，I）钙钛矿纳米晶体（NCs）是照明和显示应用的引人注目的候选物，因为其高光致发光量子产率（PLQYs）窄的PL发射光谱，尤其是调节发射的潜力在整个可见光范围内的光谱。然而，受当前制备策略的限制，像传统的半导体量子点一样，以很小的间隔连续调整整个可见光谱范围内的PL发射仍然具有挑战性。在这项工作中，我们展示了在经过修改的阴离子交换途径的基础上，以1 nm的间隔在整个可见范围内调节CsPbX 3 NC的PL发射的能力。高发光CsPbCl 3首先使用链烷酰氯作为氯源制备PLQY高达34.2％的NCs，并进一步用于阴离子交换。通过添加ZnX 2（X = Br和I）水溶液，可以连续准确地调节PL排放，并借助超声来改善卤素在阴离子交换中的反应性。除了可精确调节的PL发射位置以外，所制备的CsPbX 3 NC还具有良好的相/化学稳定性，较高的PLQY和较窄的PL发射光谱。
更新日期：2019-03-29
中文翻译：
跨全可见光谱以1 nm的间隔工程化CsPbX 3（X = Cl，Br和I）钙钛矿纳米晶体的光致发光
萤光CsPbX 3（X = Cl，Br，I）钙钛矿纳米晶体（NCs）是照明和显示应用的引人注目的候选物，因为其高光致发光量子产率（PLQYs）窄的PL发射光谱，尤其是调节发射的潜力在整个可见光范围内的光谱。然而，受当前制备策略的限制，像传统的半导体量子点一样，以很小的间隔连续调整整个可见光谱范围内的PL发射仍然具有挑战性。在这项工作中，我们展示了在经过修改的阴离子交换途径的基础上，以1 nm的间隔在整个可见范围内调节CsPbX 3 NC的PL发射的能力。高发光CsPbCl 3首先使用链烷酰氯作为氯源制备PLQY高达34.2％的NCs，并进一步用于阴离子交换。通过添加ZnX 2（X = Br和I）水溶液，可以连续准确地调节PL排放，并借助超声来改善卤素在阴离子交换中的反应性。除了可精确调节的PL发射位置以外，所制备的CsPbX 3 NC还具有良好的相/化学稳定性，较高的PLQY和较窄的PL发射光谱。
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