Reveal the Humidity Effect on the Phase Pure CsPbBr<sub>3</sub> Single Crystals Formation at Room Temperature and Its Application for Ultrahigh Sensitive X‐Ray Detector

Di, Jiayu; Li, Haojin; Su, Jie; Yuan, Haidong; Lin, Zhenhua; Zhao, Kui; Chang, Jingjing; Hao, Yue

doi:10.1002/advs.202103482

Cited by 54 publications

(55 citation statements)

References 60 publications

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“…Lead halide perovskites of ABX 3 (A = MA + , Cs + ; B = Pb 2+ , X = Cl – , Br – , I – ) have been widely studied due to their promising optoelectronic applications such as such as solar cells, − light-emitting diodes, − lasers, − X-ray detectors, − and scintillators. , However, lead-based halide perovskites are often unstable and easily hydrolyzed. − Meanwhile, the toxicity of lead limits their applications . Thus, it is urgent to develop alternative lead-free perovskites with photoelectric properties similar to those of lead-based perovskites.…”

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confidence: 99%

Competing Energy Transfer-Modulated Dual Emission in Mn²⁺-Doped Cs₂NaTbCl₆ Rare-Earth Double Perovskites

Chen

Zeng

Wei

et al. 2022

J. Phys. Chem. Lett.

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A2BIBIIIX6 double perovskites are promising materials due to their outstanding photoelectronic properties and excellent stability in the environment. Herein, we synthesized Mn2+:Cs2NaTbCl6 with dual emission through a solvothermal method for the first time. Mn2+:Cs2NaTbCl6 double perovskites exhibit excellent environmental stability and high photoluminescence quantum yields (PLQYs). The Cs2NaTbCl6 was successfully doped with Mn2+ in two modes: at Mn-feeding concentrations below 1%, Mn2+ first tend to insert into the interstitial void, but if the Mn-feeding concentration exceeds 1%, Mn2+ will further substitute Na+ site of the Cs2NaTbCl6 lattice and thus both two doping modes coexist. After Mn2+ doping, efficient energy transfer from the 5D4 level of Tb3+ ions to the 4T1 level of Mn2+ ions occurs, resulting in tunable dual emission from the Tb3+5D4 → 7FJ=6,5,4,3 transition and Mn2+4T1 → 6A1 transition. Further, LED based on the Mn2+:Cs2NaTbCl6 double perovskites exhibits excellent performance and stability. This work demonstrates a strategy to achieve novel lanthanide-based double perovskites with potential applications in photonics.

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confidence: 99%

Competing Energy Transfer-Modulated Dual Emission in Mn²⁺-Doped Cs₂NaTbCl₆ Rare-Earth Double Perovskites

Chen

Zeng

Wei

et al. 2022

J. Phys. Chem. Lett.

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“…With the increase in the PbBr 2 precursor (far from the stoichiometric ratio 1:1 for growing CsPbBr 3 ), more defects might be formed during the BC growth, thereby shortening the PL lifetimes . In contrast, the BCs grown under the ratio of 1:1 showed the τ s and τ b being 5.03 and 34.71 ns, respectively, which were longer than most of the available reports (2–4 and 7–33 ns for the fast and slow lifetimes), ,,,, although very few work presented the longer lifetimes. , The average carrier lifetime of such BCs was then estimated to be 30.06 ns, which were employed for the detailed wavelength-dependent PL studies.…”

Section: Resultsmentioning

confidence: 79%

Perovskite Bulk Crystals Grown through Antisolvent Droplet-Assisted Crystallization and Associated Wavelength-Dependent Photoluminescence Dynamics

Zheng

Cao

et al. 2022

J. Phys. Chem. C

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Perovskite bulk crystals (BCs) have been generally synthesized and grown via the temperature-mediated processes. Here, we report a facile strategy of using antisolvent droplets for assisting the crystallization and growth of large high-quality perovskite BCs (∼5 mm) at room temperature. The formation of either CsPbBr3 or Cs4PbBr6 BCs was controllable through tuning the composition of solvents used during growth. Such high-quality as-grown BCs were chosen for demonstrating the carrier–lattice interactions under photoexcitation operation. The wavelength-dependent time-resolved photoluminescence dynamics revealed that both the blue-side and red-side “solvation-like” effect between the photocarriers and surrounding lattices existed in the BCs, whereas only the blue-side one was obviously observed in the nanocrystals. The antisolvent droplet-assisted crystallization offers a versatile strategy of growing perovskite BCs with tunable compositions, and the distinct solvation behaviors enrich a fundamental understanding of photocarrier energy relaxations in perovskites with nanoscale and bulk forms.

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“…[32][33][34] Among allinorganic perovskites, cesium lead bromide (CsPbBr 3 ), which can be synthesized by a simple inverse temperature crystallization method, has attracted intensive attention due to its high air stability under the influence of both humidity and temperature. [35][36][37][38][39][40] Like other halide perovskites, CsPbBr 3 could behave as an ionic semiconductor, where an external electric field may drive ion migration of Br − and Cs + . However, such ion migration often causes unfavorable current density-voltage (J-V) hysteresis and poor stability in most optoelectronic devices.…”

Section: Introductionmentioning

confidence: 99%

Non‐Traditional Positively‐Biased Narrow‐Band Perovskite Single‐Crystal Photodetectors Enabled by Interfacial Engineering

Chen

Zhang

et al. 2022

Advanced Optical Materials

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In order to remove band-pass filters while maintaining narrow-band photodetection, three feasible approaches have been proposed. The first is the synthesis of narrow-band absorption of photoactive materials such as organic molecular materials with highly selective absorption characteristics. [7,8] Another one is the design of optic microcavity to intentionally enhance light absorption at a particular wavelength. [9,10] The third is the construction of thick films or bulk single crystals to tailor surface-charge recombination. Here, only long-wavelength light could generate photoexcited charges due to high light penetration length, whereas the shortwavelength photogenerated charges are lost as heat through charge recombination during the travel to the electrodes. [11,12] Lead halide perovskites are currently under intensive investigation owning to the exceptional optoelectronic properties that make them suitable for important applications in solar cells, light-emitting diodes, and photodetectors. [13][14][15][16][17][18][19][20][21] In particular, it has been shown that the photodetectors based on halide perovskite films with thicknesses larger than 10 µm can generate a significant narrow-band photoresponse with tunable spectralThe positive bias in theory narrows down the depletion region and thus results in significant charge injection, which should be detrimental to charge generation and collection performance for traditional photodetectors. Here, instead, it is found that the external quantum efficiency (EQE) is increased by more than 50 times when the photodetector is positively biased. A positive bias of +6 V drives ion migration of Br − and Cs + towards the anode and cathode, respectively, leading to self-doping within bulk single crystals to form an advantageous p-i-n junction for better charge collection in the devices. Meanwhile, the injected holes are allowed to tunnel through the cesium lead bromide/fullerene interface to reach the cathode which also significantly contributes to the enhancement of EQE in the forward-biased devices. The positively-biased narrow-band (full width at half maxima (FWHM) = 16 nm) photodetectors exhibit a specific detectivity of 6.5 × 10 10 Jones at 550 nm, along with the −3 dB cutoff frequency of 2776 Hz. By manipulating charge injection and ion migration using interfacial engineering, a class of non-traditional, positively-biased, and highly narrow-band photodetectors is demonstrated, which offers an alternative design strategy for imaging, biosensing, automatic control, and optical communication.

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Reveal the Humidity Effect on the Phase Pure CsPbBr₃ Single Crystals Formation at Room Temperature and Its Application for Ultrahigh Sensitive X‐Ray Detector

Cited by 54 publications

References 60 publications

Competing Energy Transfer-Modulated Dual Emission in Mn²⁺-Doped Cs₂NaTbCl₆ Rare-Earth Double Perovskites

Competing Energy Transfer-Modulated Dual Emission in Mn²⁺-Doped Cs₂NaTbCl₆ Rare-Earth Double Perovskites

Perovskite Bulk Crystals Grown through Antisolvent Droplet-Assisted Crystallization and Associated Wavelength-Dependent Photoluminescence Dynamics

Non‐Traditional Positively‐Biased Narrow‐Band Perovskite Single‐Crystal Photodetectors Enabled by Interfacial Engineering

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Reveal the Humidity Effect on the Phase Pure CsPbBr3 Single Crystals Formation at Room Temperature and Its Application for Ultrahigh Sensitive X‐Ray Detector

Cited by 54 publications

References 60 publications

Competing Energy Transfer-Modulated Dual Emission in Mn2+-Doped Cs2NaTbCl6 Rare-Earth Double Perovskites

Competing Energy Transfer-Modulated Dual Emission in Mn2+-Doped Cs2NaTbCl6 Rare-Earth Double Perovskites

Perovskite Bulk Crystals Grown through Antisolvent Droplet-Assisted Crystallization and Associated Wavelength-Dependent Photoluminescence Dynamics

Non‐Traditional Positively‐Biased Narrow‐Band Perovskite Single‐Crystal Photodetectors Enabled by Interfacial Engineering

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Reveal the Humidity Effect on the Phase Pure CsPbBr₃ Single Crystals Formation at Room Temperature and Its Application for Ultrahigh Sensitive X‐Ray Detector

Competing Energy Transfer-Modulated Dual Emission in Mn²⁺-Doped Cs₂NaTbCl₆ Rare-Earth Double Perovskites

Competing Energy Transfer-Modulated Dual Emission in Mn²⁺-Doped Cs₂NaTbCl₆ Rare-Earth Double Perovskites