Suppression of temperature quenching in perovskite nanocrystals for efficient and thermally stable light-emitting diodes

Liu, Mingming; Wan, Qun; Wang, Huamiao; Carulli, Francesco; Sun, Xiaochuan; Zheng, Weilin; Kong, Long; Zhang, Qi; Zhang, Congyang; Zhang, Qinggang; Brovelli, Sergio; Li, Liang

doi:10.1038/s41566-021-00766-2

Cited by 336 publications

(327 citation statements)

References 50 publications

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“…Considering the gradually enhanced electronegativity among the halide series of I, Br, Cl, and F, [4] we argue that fluorine ion (F − ), after being introduced into the crystal lattice of metal halide perovskite such as α-phase CsPbI 3 , can readily occupy the halide vacancies, anchoring to the uncoordinated host cations and forming strong chemical bonds of cation-fluorine (e.g., Pb-F) in the perovskite lattice, [38,39] as schematically illustrated in Figure 1b. In this way, both the intrinsic cation and anion defects of metal halide perovskite can be effectively passivated by these external F − ions, thereby yielding the latticestabilized perovskites with superior stability and optoelectronic properties as compared to the pristine ones (Figure 1b,c).…”

Section: Introductionmentioning

confidence: 99%

Constructing All‐Inorganic Perovskite/Fluoride Nanocomposites for Efficient and Ultra‐Stable Perovskite Solar Cells

Wei

Zhao

Liu

et al. 2021

Adv Funct Materials

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Organic-inorganic hybrid perovskite solar cells (PSCs) have rapidly developed over the past decade and have achieved the latest certified power conversion efficiency (PCE) up to 25.5%. However, unsatisfactory long-term operational stability for these hybrid PSCs remains a huge obstacle to further development and commercialization. Herein, a unique hetero-structured CsPbI 3 / CaF 2 perovskite/fluoride nanocomposites (PFNCs) is fabricated via a newly developed facile two-step hetero-epitaxial growth strategy to deliver efficient and ultra-stable PSCs. After being incorporated into the crystal lattice of α-phase CsPbI 3 perovskite, the cubic-phase CaF 2 in the resultant CsPbI 3 / CaF 2 PFNCs can not only passivate the intrinsic defects of CsPbI 3 perovskite itself but also effectively suppress the notorious ion migration in hybrid perovskite Cs 0.05 FA 0.81 MA 0.14 PbI 2.55 Br 0.45 (CsFAMA) thin-films of PSCs. As such, the CsFAMA PSC devices based on CsPbI 3 /CaF 2 -deposited perovskite thin-film achieve a mean PCE of 20.45%, in sharp contrast to 19.33% of the control devices without deposition. Specifically, the CsPbI 3 /CaF 2 -deposited PSC retains 85% of its original PCE after 1000 h continuous operation at the maximum power point under AM 1.5G solar light, far better than those of the control and CsPbI 3 -deposited PSCs with a device T 85 lifetime of 315 and 125 h, respectively.

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Section: Introductionmentioning

confidence: 99%

Constructing All‐Inorganic Perovskite/Fluoride Nanocomposites for Efficient and Ultra‐Stable Perovskite Solar Cells

Wei

Zhao

Liu

et al. 2021

Adv Funct Materials

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“…The essential reason is believed to come from the perovskite itself and its ion-crystal characteristics, such as easy ion migration, trends of electrochemical reaction and interfacial reaction 113 . Some very recent processes are working on reducing defects 75 , improving thermal stability 114 , enhancing spectral stability under an electric field 79 , and preventing various chemical reactions of perovskites 115 . Some long-lifetime optoelectronic devices made with perovskite materials have been realised in recent studies, e.g., a long half-lifetime of 682 hours in formamidinium-based PeLEDs 115 and over 1000 h (lifetime: T 90 ) in perovskite-based solar cells 116 , 117 .…”

Section: Discussionmentioning

confidence: 99%

Research progress of full electroluminescent white light-emitting diodes based on a single emissive layer

et al. 2021

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Carbon neutrality, energy savings, and lighting costs and quality have always led to urgent demand for lighting technology innovation. White light-emitting diodes (WLEDs) based on a single emissive layer (SEL) fabricated by the solution method have been continuously researched in recent years; they are advantageous because they have a low cost and are ultrathin and flexible. Here, we reviewed the history and development of SEL–WLEDs over recent years to provide inspiration and promote their progress in lighting applications. We first introduced the emitters and analysed the advantages of these emitters in creating SEL–WLEDs and then reviewed some cases that involve the above emitters, which were formed via vacuum thermal evaporation or solution processes. Some notable developments that deserve attention are highlighted in this review due to their potential use in SEL–WLEDs, such as perovskite materials. Finally, we looked at future development trends of SEL–WLEDs and proposed potential research directions.

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“…[ 22 ] It has been demonstrated that the thermal‐induced PL quenching could be greatly supressed by defect passivation. [ 23 ] From another point of view, a higher defect density results in more obvious PL quenching, thus a higher temperature sensitivity can be achieved. In this regard, temperature sensing based on conventional semiconductor nanocrystals and lanthanide doped upconversion nanoparticles generally suffers from relatively low sensitivity.…”

Section: Introductionmentioning

confidence: 99%

“…In LHP NCs, bright fluorescence can be retained, even the density of Schottky defects (point defects) up to 1–2 at%, [ 21 ] which promotes the template‐assisted ligand‐free synthesis of highly emissive LHP NCs. [ 27–29 ] Recently, the advancements in scalable synthesis, [ 30 ] and post‐chemical treatment and surface engineering [ 31,32 ] have promoted the substantial progress of LHP NCs in sensing, [ 33–35 ] optoelectronics, [ 23,31,36 ] anti‐counterfeiting, [ 37,38 ] and more. [ 39,40 ] For temperature sensing, S r up to 7.12% (100 °C) and 10.04% (−130 °C) have been achieved with LHP NCs based materials.…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive Temperature Sensing Based on Ligand‐Free Alloyed CsPbCl_xBr₃₋_x Perovskite Nanocrystals Confined in Hollow Mesoporous Silica with High Density of Halide Vacancies

Huang

Lai

Jin

et al. 2021

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Temperature sensing based on fluorescent semiconductor nanocrystals has recently received immense attention. Enhancing the trap‐facilitated thermal quenching of the fluorescence should be an effective approach to achieve high sensitivity for temperature sensing. Compared with conventional semiconductor nanocrystals, the defect‐tolerant feature of lead halide perovskite nanocrystals (LHP NCs) endows them with high density of defects. Here, hollow mesoporous silica (h‐SiO2) template‐assisted ligand‐free synthesis and halogen manipulation (chloride‐importing) are proposed to fabricate highly defective yet fluorescent CsPbCl1.2Br1.8 NCs confined in h‐SiO2 (CsPbCl1.2Br1.8 NCs@h‐SiO2) for ultrasensitive temperature sensing. The trap barrier heights, exciton–phonon scattering, and trap state filling process in the CsPbCl1.2Br1.8 NCs@h‐SiO2 and CsPbBr3 NCs@h‐SiO2 are studied to illustrate the higher temperature sensitivity of CsPbCl1.2Br1.8 NCs@h‐SiO2 at physiological temperature range. By integrating the thermal‐sensitive CsPbCl1.2Br1.8 NCs@h‐SiO2 and thermal‐insensitive K2SiF6:Mn4+ phosphor into the flexible ethylene–vinyl acetate polymer matrix, ratiometric temperature sensing from 30.0 °C to 45.0 °C is demonstrated with a relative temperature sensitivity up to 13.44% °C−1 at 37.0 °C. The composite film shows high potential as a thermometer for monitoring the body temperature. This work demonstrates the unparalleled temperature sensing performance of LHP NCs and provides new inspiration on switching the defects into advantages in sensing applications.

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Suppression of temperature quenching in perovskite nanocrystals for efficient and thermally stable light-emitting diodes

Cited by 336 publications

References 50 publications

Constructing All‐Inorganic Perovskite/Fluoride Nanocomposites for Efficient and Ultra‐Stable Perovskite Solar Cells

Constructing All‐Inorganic Perovskite/Fluoride Nanocomposites for Efficient and Ultra‐Stable Perovskite Solar Cells

Research progress of full electroluminescent white light-emitting diodes based on a single emissive layer

Ultrasensitive Temperature Sensing Based on Ligand‐Free Alloyed CsPbCl_xBr₃₋_x Perovskite Nanocrystals Confined in Hollow Mesoporous Silica with High Density of Halide Vacancies

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Suppression of temperature quenching in perovskite nanocrystals for efficient and thermally stable light-emitting diodes

Cited by 336 publications

References 50 publications

Constructing All‐Inorganic Perovskite/Fluoride Nanocomposites for Efficient and Ultra‐Stable Perovskite Solar Cells

Constructing All‐Inorganic Perovskite/Fluoride Nanocomposites for Efficient and Ultra‐Stable Perovskite Solar Cells

Research progress of full electroluminescent white light-emitting diodes based on a single emissive layer

Ultrasensitive Temperature Sensing Based on Ligand‐Free Alloyed CsPbClxBr3−x Perovskite Nanocrystals Confined in Hollow Mesoporous Silica with High Density of Halide Vacancies

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Ultrasensitive Temperature Sensing Based on Ligand‐Free Alloyed CsPbCl_xBr₃₋_x Perovskite Nanocrystals Confined in Hollow Mesoporous Silica with High Density of Halide Vacancies