Controlling the Cavity Structures of Two‐Photon‐Pumped Perovskite Microlasers

Zhang, Wei; Peng, Lan; Liu, Jie; Tang, Aiwei; Hu, Jin‐Song; Yao, Jiannian; Zhao, Yong Sheng

doi:10.1002/adma.201505927

Cited by 216 publications

(203 citation statements)

References 51 publications

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“…The length of perovskite wires ranges from 2 to 30 µm; the width and height ranges from 200 nm to 1 µm ( Figure S6, Supporting Information). [54] The XRD pattern contains a set of strong (00l) diffraction peaks, indicating (001) series of crystal planes facets exposed, which are consistent with the SAED results. Transmission electron microscope (TEM, Figure 1d) and X-ray diffraction (XRD, Figure 1e) were performed to investigate crystal structure of as prepared perovskite wires.…”

Section: Polariton Lasingsupporting

confidence: 85%

“…The emission intensity increases superlinearly with excitation power even though power is quite low, suggesting dominant exciton-polariton scattering. [64] Although lasing has been widely reported in MAPbBr 3 nanowires and nanoplatelets, [54,65,28,66] the lasing mechanisms are still not consistent. That is, the lower energy modes are more pronounced with increasing excitation, which is attributed to the increase of photon component of polaritons at low energy side.…”

Section: Wwwadvopticalmatdementioning

confidence: 99%

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Strong Exciton–Photon Coupling in Hybrid Inorganic–Organic Perovskite Micro/Nanowires

Zhang

Shang

et al. 2017

Advanced Optical Materials

127

102

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breakthrough in power conversion efficiency of 22.1%, [19] comparable to conventional silicon based solar cell. Wavelength tunable LEDs and optically pumped lasers have been achieved by simply changing the ration of halide anions. However, there are still challenges in electroluminescence with high efficiency and electrically pumped lasers. [20] One intrinsic limitation in perovskite is relatively low exciton binding energy that cannot suppress the exciton ionization in the working condition devices. [21] For example, microwave photoconductance and photoluminescence (PL) study revealed exciton binding energy of 18-32 meV [22,23] in MAPbI 3 , comparable to room temperature thermal energies of K B T ≈ 25 meV. By substitution doping of Cl, larger exciton binding energy of 62.3 ± 8.9 meV can be obtained in perovskite thin film. [24] In MAPbBr 3 quantum dots, exciton binding energy can be as large as 375 meV in comparison to their bulk counterpart of 65 meV. [25] In this regard, low dimensional perovskite single crystals with optical or size confinement are becoming promising in complementing their bulk counterparts. With reduced dimensionality, lead halide perovskite provides a platform where exciton behavior, such as exciton-photon interaction [26,27] and exciton binding energy, [28] can be well modulated, giving the pathway to obtain highly efficient optoelectronic devices.

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Section: Polariton Lasingsupporting

confidence: 85%

Section: Wwwadvopticalmatdementioning

confidence: 99%

Strong Exciton–Photon Coupling in Hybrid Inorganic–Organic Perovskite Micro/Nanowires

Zhang

Shang

et al. 2017

Advanced Optical Materials

127

102

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“…Especially, heterostructures consisted of noble metal and magnetic NPs, which could make good use of the special plasmonic resonance properties of noble metal counterpart and the unique magnetic properties of magnetic counterpart, have exhibited excellent potential applications in various fields such as multimodal imaging, targeting cancer therapy, and recyclable catalysis 4. Recently, plasmon‐enhanced two‐photon fluorescence (TPF) of Au and Ag NPs exhibit great advantages over conventional one‐photon fluorescent imaging 5. The complementary advantages of the magnetic resonance imaging (MRI) and TPF in one nanoprobe can endow probes the ability of accurate positioning of the overall tumor in the body and the fine local details, which is attractive for the early diagnosis of tumors 6.…”

Section: Introductionmentioning

confidence: 99%

Galvanic Displacement Synthesis of Monodisperse Janus‐ and Satellite‐Like Plasmonic–Magnetic Ag–Fe@Fe₃O₄ Heterostructures with Reduced Cytotoxicity

Zhang

Yang

et al. 2018

Advanced Science

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The unique physicochemical properties of silver nanoparticles offer a large potential for biomedical application, however, the serious biotoxicity restricts their usage. Herein, nanogalvanic couple Ag–Fe@Fe3O4 heterostructures (AFHs) are designed to prevent Ag+ release from the cathodic Ag by sacrificial anodic Fe, which can reduce the cytotoxicity of Ag. AFHs are synthesized with modified galvanic displacement strategy in nonaqueous solution. To eliminate the restriction of lattice mismatch between Fe and Ag, amorphous Fe@Fe3O4 nanoparticles (NPs) are selected as seeds, meanwhile, reductive Fe can reduce Ag precursor directly even at as low as 20 °C without additional reductant. The thickness of the Fe3O4 shell can influence the amorphous properties of AFHs, and a series of Janus‐ and satellite‐like AFHs are synthesized. A “cut‐off thickness” effect is proposed based on the abnormal phenomenon that with the increase of reaction temperature, the diameter of Ag in AFHs decreases. Because of the interphase interaction and the coupling effect of Ag and Fe@Fe3O4, the AFHs exhibit unique optical and magnetic properties. This strategy for synthesis of monodisperse heterostructures can be extended for other metals, such as Au and Cu.

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“…

large organic ligands with the formula of A 2 A′ n−1 M n X 3n+1 . [13][14][15] Through down-conversion excitation, 2D perovskites have shown efficient light emission in spontaneous [16,17] and stimulated [18,19] regimes. [13][14][15] Through down-conversion excitation, 2D perovskites have shown efficient light emission in spontaneous [16,17] and stimulated [18,19] regimes.

…”

mentioning

confidence: 99%

Two‐Photon Up‐Conversion Photoluminescence Realized through Spatially Extended Gap States in Quasi‐2D Perovskite Films

Zhu

Liu

et al. 2019

Advanced Materials

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large organic ligands with the formula of A 2 A′ n−1 M n X 3n+1 . [9][10][11][12] Such 2D perovskites can demonstrate remarkable tunabilities on optical properties via controlling morphological structures by selecting different functional A/A′ molecules. [13][14][15] Through down-conversion excitation, 2D perovskites have shown efficient light emission in spontaneous [16,17] and stimulated [18,19] regimes. Recently, amplified spontaneous emission (ASE) have been reported in 2D perovskites [(NMA) 2 (FA)Pb 2 Br 7 and (NMA) 2 (FA)Pb 2 Br 1 I 6 ] with stoichiometrically tunable wavelength from visible to near-infrared spectral range (530-810 nm) with the gain coefficient as high as > 300 cm −1 under pulse laser excitation. [20] On the other hand, it has been found that the edge states can be formed in 2D perovskites with light-emitting properties below the bandgap. [21] The discovery of edge states triggers a fundamental question of whether the gap states can be introduced as a new approach to develop multi-photon up-conversion light emission in solution-processing quasi-2D perovskite films. We should note that an up-conversion ASE was indeed observed at 720 nm in inorganic 3D perovskite (CsPbI 3 ) nanoplates under the infrared pulse laser excitation of 1200 nm. [22] In this work, we explore a new approach to realize multi-photon up-conversion photoluminescence (PL) in quasi-2D perovskite [(PEA) 2 (MA) 4 Pb 5 Br 16 (n = 5)] films by directly exciting broad gap states with continuous-wave (CW) infrared photoexcitation. The broad gap states were adjusted by selecting different n values (n = 1-5) with accelerated crystallization in quasi-2D perovskite films prepared with antisolvent processing method. Here, we found that an up-conversion PL can be observed in 2D perovskite [(PEA) 2 (MA) 4 Pb 5 Br 16 (n = 5)] films under CW 980 nm excitation when broad infrared absorption is appeared between 800 and 1500 nm. To further understand the up-conversion PL under CW infrared excitation, magnetic field effects of PL (namely, magneto-PL) were used to identify whether the gap states function as spatially extended states to generate multiphoton absorption in quasi-2D perovskite films. Furthermore, polarization-dependent PL upon using linearly and circularly polarized photoexcitations was used to explore the effects of orbit-orbit interaction on multi-photon up-conversion PL under A new approach to generate a two-photon up-conversion photoluminescence (PL) by directly exciting the gap states with continuous-wave (CW) infrared photoexcitation in solution-processing quasi-2D perovskite films [(PEA) 2 (MA) 4 Pb 5 Br 16 with n = 5] is reported. Specifically, a visible PL peaked at 520 nm is observed with the quadratic power dependence by exciting the gap states with CW 980 nm laser excitation, indicating a two-photon up-conversion PL occurring in quasi-2D perovskite films. Decreasing the gap states by reducing the n value leads to a dramatic decrease in the twophoton up-conversion PL signal. This confirms that the gap states are indeed ...

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Controlling the Cavity Structures of Two‐Photon‐Pumped Perovskite Microlasers

Cited by 216 publications

References 51 publications

Strong Exciton–Photon Coupling in Hybrid Inorganic–Organic Perovskite Micro/Nanowires

Strong Exciton–Photon Coupling in Hybrid Inorganic–Organic Perovskite Micro/Nanowires

Galvanic Displacement Synthesis of Monodisperse Janus‐ and Satellite‐Like Plasmonic–Magnetic Ag–Fe@Fe₃O₄ Heterostructures with Reduced Cytotoxicity

Two‐Photon Up‐Conversion Photoluminescence Realized through Spatially Extended Gap States in Quasi‐2D Perovskite Films

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Controlling the Cavity Structures of Two‐Photon‐Pumped Perovskite Microlasers

Cited by 216 publications

References 51 publications

Strong Exciton–Photon Coupling in Hybrid Inorganic–Organic Perovskite Micro/Nanowires

Strong Exciton–Photon Coupling in Hybrid Inorganic–Organic Perovskite Micro/Nanowires

Galvanic Displacement Synthesis of Monodisperse Janus‐ and Satellite‐Like Plasmonic–Magnetic Ag–Fe@Fe3O4 Heterostructures with Reduced Cytotoxicity

Two‐Photon Up‐Conversion Photoluminescence Realized through Spatially Extended Gap States in Quasi‐2D Perovskite Films

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Product

Resources

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Galvanic Displacement Synthesis of Monodisperse Janus‐ and Satellite‐Like Plasmonic–Magnetic Ag–Fe@Fe₃O₄ Heterostructures with Reduced Cytotoxicity