Wu Yangqing, Han Qiaoling, Wang Mei, Juan Fangying, Hou Guozhi, Xun Fan, Wei Haoming, Xu Jun, Cao Bingqiang
Opt Express. 2021 Oct 25;29(22):36988-36996. doi: 10.1364/OE.443112.
Large scale ordered Au nanoarrays are fabricated by nanosphere lithography technique. The photoluminescence improvement of CsPbBrI nanocrystals by more than three times is realized in the CsPbBrI nanocrystal/Au nanoarray/Si structure. Time-resolved photoluminescence decay curves indicate that the lifetime is decreased by introducing the Au nanoarrays, which results in a increasing radiation recombination rate. The reflection spectra with two major valleys (the dip in the curve) located at ∼325 nm and 545 nm of Au nanoarray/Si structure, which illustrates two plasmonic resonance absorption peaks of the Au nanoarrays. The enhancement of photoluminescence is ascribed to a well match between the excitation/emission of CsPbBrI nanocrystals and localized surface plasmon/gap plasmon resonance absorption of the ordered Au nanoarrays, as also revealed from the finite-difference time-domain simulation analysis. Our work offers an effective strategy to improve the fluorescence of perovskite nanocrystals and provide the potential for further applications.
通过纳米球光刻技术制备了大规模有序的金纳米阵列。在CsPbBrI纳米晶体/金纳米阵列/硅结构中，CsPbBrI纳米晶体的光致发光提高了三倍以上。时间分辨光致发光衰减曲线表明，引入金纳米阵列会降低寿命，这导致辐射复合率增加。金纳米阵列/硅结构的反射光谱有两个位于约325纳米和545纳米处的主要谷（曲线中的凹陷），这说明了金纳米阵列的两个等离子体共振吸收峰。光致发光的增强归因于CsPbBrI纳米晶体的激发/发射与有序金纳米阵列的局域表面等离子体/间隙等离子体共振吸收之间的良好匹配，有限时域差分模拟分析也揭示了这一点。我们的工作提供了一种提高钙钛矿纳米晶体荧光的有效策略，并为进一步应用提供了潜力。
