Efficient and stable green-emitting CsPbBr3 perovskite nanocrystals in a microcapsule for light emitting diodes

Song, Young Hoon; Park, Sang-Yul; Yoo, Jinsu; Park, Won Kyu; Kim, Hyo Sun; Choi, Seung Hee; Kwon, Seok Bin; Kang, Bong Kyun; Kim, Jae Pil; Jung, Hyun Suk; Yoon, Dae Ho; Yang, Woo Seok; Seo, Young‐Soo

doi:10.1016/j.cej.2018.05.153

Cited by 37 publications

(13 citation statements)

References 53 publications

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“…Moreover efficient electroluminescence 51 and high and tunable optical gain at room temperature have been demonstrated 13 . The peculiar properties of NCs also allowed to improve the photoluminescence intensity stability by acting on the synthesis process 52–54 , by ligands engineering 55–57 and by incorporation into hydrophobic polymer matrices 58,59 or microcapsules 60 .…”

Section: Introductionmentioning

confidence: 99%

Amplified Spontaneous Emission Threshold Reduction and Operational Stability Improvement in CsPbBr3 Nanocrystals Films by Hydrophobic Functionalization of the Substrate

Giorgi

Krieg

Kovalenko

et al. 2019

Sci Rep

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The use of lead halide perovskites in optoelectronic and photonic devices is mainly limited by insufficient long-term stability of these materials. This issue is receiving growing attention, mainly owing to the operational stability improvement of lead halide perosvkites solar cells. On the contrary, fewer efforts are devoted to the stability improvement of light amplification and lasing. In this report we demonstrate that a simple hydrophobic functionalization of the substrates with hexamethyldisilazane (HMDS) allows to strongly improve the Amplified Spontaneous Emission (ASE) properties of drop cast CsPbBr3 nanocrystal (NC) thin films. In particular we observe an ASE threshold decrease down to 45% of the value without treatment, an optical gain increase of up to 1.5 times and an ASE operational stability increase of up to 14 times. These results are ascribed to a closer NC packing in the films on HMDS treated substrate, allowing an improved energy transfer towards the larger NCs within the NC ensemble, and to the reduction of the film interaction with moisture. Our results propose hydrophobic functionalization of the substrates as an easy approach to lower the ASE and lasing thresholds, while simultaneously increasing the active material stability.

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Section: Introductionmentioning

confidence: 99%

Amplified Spontaneous Emission Threshold Reduction and Operational Stability Improvement in CsPbBr3 Nanocrystals Films by Hydrophobic Functionalization of the Substrate

Giorgi

Krieg

Kovalenko

et al. 2019

Sci Rep

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“…The all-inorganic cesium lead tribromide perovskite (CsPbBr 3 ) is an attractive material with several perspective applications in photovoltaics, 1 photodetectors, 2 , 3 and light emitting devices 4 , 5 due to its optoelectronic properties 6 , 7 and various fabrication methods. 8 − 10 Particularly, in the field of ionizing energy detection, many studies have been focused on thin film approaches, 9 , 11 yet the use of millimeter-thick single crystals has gained more attention recently.…”

mentioning

confidence: 99%

Surface versus Bulk Currents and Ionic Space-Charge Effects in CsPbBr₃ Single Crystals

Almora

Matt

These

et al. 2022

J. Phys. Chem. Lett.

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CsPbBr 3 single crystals have potential for application in ionizing-radiation detection devices due to their optimal optoelectronic properties. Yet, their mixed ionic–electronic conductivity produces instability and hysteretic artifacts hindering the long-term device operation. Herein, we report an electrical characterization of CsPbBr 3 single crystals operating up to the time scale of hours. Our fast time-of-flight measurements reveal bulk mobilities of 13–26 cm 2 V –1 s –1 with a negative voltage bias dependency. By means of a guard ring (GR) configuration, we separate bulk and surface mobilities showing significant qualitative and quantitative transport differences. Our experiments of current transients and impedance spectroscopy indicate the formation of several regimes of space-charge-limited current (SCLC) associated with mechanisms similar to the Poole–Frenkel ionized-trap-assisted transport. We show that the ionic-SCLC seems to be an operational mode in this lead halide perovskite, despite the fact that experiments can be designed where the contribution of mobile ions to transport is negligible.

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“…29 The diffraction peaks of CsPbBr 3 QDs agree well with a cubic CsPbBr 3 phase (PDF# 54-0752). 44,45 The CsPbBr 3 /BNNF composite sample shows characteristic peaks originating from both BNNFs and CsPbBr 3 QDs, indicating that the product mainly consists of two crystal phases. The TEM and XRD results reveal that CsPbBr 3 QDs have been successfully loaded on the surface of BNNFs to form the CsPbBr 3 /BNNF composites.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Synthesis of Perovskite CsPbBr₃ Quantum Dots/Porous Boron Nitride Nanofiber Composites with Improved Stability and Their Reversible Optical Response to Ammonia

et al. 2019

Inorg. Chem.

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All-inorganic CsPbX3 (X = Cl, Br, I) perovskite quantum dots (QDs) have great potential for various applications due to their excellent photoluminescence properties. However, poor stability under long-term storage hinders their applications. Herein we report the utilization of porous boron nitride nanofibers (BNNFs) as a promising carrier for anchoring of CsPbBr3 QDs. Due to the good dispersion and immobilization of CsPbBr3 QDs, the resulting CsPbBr3/BNNF composites show excellent photostability and superior long-term storage stability in an air environment. Moreover, the CsPbBr3/BNNF composites exhibit an interesting ammonia-responsive behavior: i.e., a distinct decrease in photoluminescence intensity upon exposure to ammonia gas and the subsequent photoluminescence recovery after post-treatment in nitrogen gas. Even after treatment with ammonia gas for 3 h, the composites can still be recovered under nitrogen gas treatment. The fast response, reversibility, and stability of CsPbBr3/BNNF composites in the presence of ammonia gas could inspire a broader range of applications.

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Efficient and stable green-emitting CsPbBr3 perovskite nanocrystals in a microcapsule for light emitting diodes

Cited by 37 publications

References 53 publications

Amplified Spontaneous Emission Threshold Reduction and Operational Stability Improvement in CsPbBr3 Nanocrystals Films by Hydrophobic Functionalization of the Substrate

Amplified Spontaneous Emission Threshold Reduction and Operational Stability Improvement in CsPbBr3 Nanocrystals Films by Hydrophobic Functionalization of the Substrate

Surface versus Bulk Currents and Ionic Space-Charge Effects in CsPbBr₃ Single Crystals

Synthesis of Perovskite CsPbBr₃ Quantum Dots/Porous Boron Nitride Nanofiber Composites with Improved Stability and Their Reversible Optical Response to Ammonia

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Efficient and stable green-emitting CsPbBr3 perovskite nanocrystals in a microcapsule for light emitting diodes

Cited by 37 publications

References 53 publications

Amplified Spontaneous Emission Threshold Reduction and Operational Stability Improvement in CsPbBr3 Nanocrystals Films by Hydrophobic Functionalization of the Substrate

Amplified Spontaneous Emission Threshold Reduction and Operational Stability Improvement in CsPbBr3 Nanocrystals Films by Hydrophobic Functionalization of the Substrate

Surface versus Bulk Currents and Ionic Space-Charge Effects in CsPbBr3 Single Crystals

Synthesis of Perovskite CsPbBr3 Quantum Dots/Porous Boron Nitride Nanofiber Composites with Improved Stability and Their Reversible Optical Response to Ammonia

Contact Info

Product

Resources

About

Surface versus Bulk Currents and Ionic Space-Charge Effects in CsPbBr₃ Single Crystals

Synthesis of Perovskite CsPbBr₃ Quantum Dots/Porous Boron Nitride Nanofiber Composites with Improved Stability and Their Reversible Optical Response to Ammonia