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Optically‐Controlled Quantum Size Effect in a Hybrid Nanocavity Composed of a Perovskite Nanoparticle and a Thin Gold Film
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2021-01-22 , DOI: 10.1002/lpor.202000480 Shulei Li 1 , Maohui Yuan 1 , Weijie Zhuang 1 , Xin Zhao 1 , Shaolong Tie 2 , Jin Xiang 3 , Sheng Lan 1
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2021-01-22 , DOI: 10.1002/lpor.202000480 Shulei Li 1 , Maohui Yuan 1 , Weijie Zhuang 1 , Xin Zhao 1 , Shaolong Tie 2 , Jin Xiang 3 , Sheng Lan 1
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Metal halide perovskites have attracted great interest in recent years and their emission wavelength can be adjusted either by doping impurities or by exploiting quantum size effect. Here, it is reported that the realization of optically‐controlled quantum size effect in a hybrid nanocavity composed of a perovskite (CsPbBr3) nanoparticle and a thin gold (Au) film. Such nanocavities are created by synthesizing polycrystalline CsPbBr3 nanoparticles composed of quantum dots on a thin Au film via chemical vapor deposition, which emit luminescence at ≈488 nm under the excitation of femtosecond laser pulses with a low repetition rate. The phase transition from polycrystalline to monocrystalline, which quenches the quantum size effect and shifts the emission wavelength to ≈515 nm, can be introduced in CsPbBr3 nanoparticles by simply increasing the laser power. Interestingly, such a phase transition is reversible provided that the laser power is lower than a threshold. Consequently, four optical states including dual‐wavelength emission, can be achieved by deliberately setting the laser power. The underlying physical mechanism is unveiled by the static and transient temperature distributions simulated for the hybrid nanocavity. The findings open a new avenue for designing novel photonic devices based on perovskite nanoparticles and plasmonic nanostructures.
中文翻译：
由钙钛矿纳米颗粒和金薄膜组成的混合纳米腔中的光控量子尺寸效应
近年来，金属卤化物钙钛矿引起了极大的兴趣，可以通过掺杂杂质或通过利用量子尺寸效应来调节它们的发射波长。在此，据报道，在由钙钛矿（CsPbBr 3）纳米粒子和金（Au）薄膜组成的杂化纳米腔中实现了光控量子尺寸效应。此类纳米腔是通过合成多晶CsPbBr 3产生的通过化学气相沉积在Au薄膜上由量子点组成的纳米粒子，在飞秒激光脉冲的激发下，以低重复频率发射约488 nm的光。可以在CsPbBr 3中引入从多晶到单晶的相变，这消除了量子尺寸效应并将发射波长移至≈515nm通过简单地增加激光功率即可形成纳米颗粒。有趣的是，只要激光功率低于阈值，这种相变是可逆的。因此，通过有意地设置激光功率，可以实现包括双波长发射在内的四个光学状态。通过为混合纳米腔模拟的静态和瞬态温度分布揭示了潜在的物理机制。这些发现为基于钙钛矿纳米粒子和等离子体纳米结构的新型光子器件设计开辟了一条新途径。
更新日期：2021-03-11
中文翻译：
由钙钛矿纳米颗粒和金薄膜组成的混合纳米腔中的光控量子尺寸效应
近年来，金属卤化物钙钛矿引起了极大的兴趣，可以通过掺杂杂质或通过利用量子尺寸效应来调节它们的发射波长。在此，据报道，在由钙钛矿（CsPbBr 3）纳米粒子和金（Au）薄膜组成的杂化纳米腔中实现了光控量子尺寸效应。此类纳米腔是通过合成多晶CsPbBr 3产生的通过化学气相沉积在Au薄膜上由量子点组成的纳米粒子，在飞秒激光脉冲的激发下，以低重复频率发射约488 nm的光。可以在CsPbBr 3中引入从多晶到单晶的相变，这消除了量子尺寸效应并将发射波长移至≈515nm通过简单地增加激光功率即可形成纳米颗粒。有趣的是，只要激光功率低于阈值，这种相变是可逆的。因此，通过有意地设置激光功率，可以实现包括双波长发射在内的四个光学状态。通过为混合纳米腔模拟的静态和瞬态温度分布揭示了潜在的物理机制。这些发现为基于钙钛矿纳米粒子和等离子体纳米结构的新型光子器件设计开辟了一条新途径。
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