Ultrastable glass-protected all-inorganic perovskite quantum dots with finely tunable green emissions for approaching Rec. 2020 backlit display

Yang, Changbin; Zhuang, Bin; Lin, Jidong; Wang, Shaoxiong; Liu, Menglong; Jiang, Naizhong; Chen, Daqin

doi:10.1016/j.cej.2020.125616

Cited by 77 publications

(48 citation statements)

References 33 publications

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“…2020) color standard is the benchmark of colors possible in a display based on a combination of the ideal red, green and blue pixels. 48 To calculate whether a material meets this standard, the peak wavelength of emitted light was converted to X,Y space in the CIE color graph (Commision Internationale de L'Eclairage). These (X,Y) values were then plotted on a graph and the overlap with Rec.…”

Section: Price Assessmentmentioning

confidence: 99%

Are substitutes to Cd-based quantum dots in displays more sustainable, effective, and cost competitive? An alternatives assessment approach

Béchu

Ghoshal

Moores

et al. 2021

Preprint

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Light emissive organics and inorganic nanoparticles are substance classes competing for applications in displays in the form of organic LEDs (OLEDs) and quantum LEDs (QLEDs), respectively. Upcoming substance classes (perovskites) and Q-OLED displays also contain novel nanomaterials and organics for these applications. However, the sustainability of these emissive substances is difficult to assess quickly and broadly because of their complexity, their inherently different structures, and their rapid evolution in the literature. We propose the use of an alternatives assessment to compare the hazard, cost, and performance of these competing substances, with a focus on replacing cadmium-containing quantum dots. The cost assessment highlights competitiveness of OLEDs because of their low amounts needed per display, but performance assessments do not identify a preferred alternative. The hazard results indicate there is no clear alternative either, with each novel nanomaterial or organic substance having different negative aspects. These results identify the need for a low-hazard high-performing alternative substance, and the assessment provides a framework for researchers to evaluate their own novel substances.

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Section: Price Assessmentmentioning

confidence: 99%

Are substitutes to Cd-based quantum dots in displays more sustainable, effective, and cost competitive? An alternatives assessment approach

Béchu

Ghoshal

Moores

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…So far, compared to the organic-inorganic lead halide perovskite materials with a three-dimensional APbX 3 structure (where A for CH 3 NH 3 + or HC(NH 2 ) 2 + cation; X for I − , Br − , Cl − halide ion), which prone to degradation under moisture, oxygen, heat, and illumination exposure (Cho et al, 2018), all-inorganic perovskites such as CsPbX 3 have drew widespread attention due to their excellent stability and high PLQY (Shen et al, 2020;Yang et al, 2020;Lin et al, 2021). However, mainly derived from the low solubility of CsBr precursor in commonly used solvents such as dimethyl sulfoxide (Zhang et al, 2016), all-inorganic perovskite films prepared by one-step solution-processed method are often rough and discontinuous with pinholes, which leads to large leakage current, thus compromising device efficiency and stability.…”

Section: Introductionmentioning

confidence: 99%

Hole Transport Layer Free Perovskite Light-Emitting Diodes With High-Brightness and Air-Stability Based on Solution-Processed CsPbBr3-Cs4PbBr6 Composites Films

et al. 2022

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Recently, perovskite light-emitting diodes (PeLEDs) have drew widespread attention due to their high efficiencies. However, because of the sensitivity to moisture and oxygen, perovskite luminescent layers are usually prepared in high-purity nitrogen environment, which increases the cost and process complexity of device preparation and seriously hindrances its commercialization of PeLED in lighting and display application. Herein, dual-phase all-inorganic composite CsPbBr3-Cs4PbBr6 films are fabricated from CsBr-rich perovskite solutions by a simple one-step spin-coating method in the air with high humidity. Compared with the pure CsPbBr3 film, the composite CsPbBr3-Cs4PbBr6 film has much stronger photoluminescence emission and longer fluorescence lifetime, accompanied by increased photoluminescence quantum yield (33%). As a result, we obtained green PeLED devices without hole transport layer exhibiting a maximum brightness of 72,082 cd/m2 and a maximum external quantum efficiency of about 2.45%, respectively. More importantly, the champion device shows excellent stability with operational half-lifetime exceeding 1,000 min under continuous operation in the air. The dual-phase all-inorganic composite CsPbBr3-Cs4PbBr6 film shows attractive prospect for advanced light emission applications.

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“…Detailed chromaticity engineering is required for colors in the backlight display, which is an extremely enormous challenge for green downconverters because the visual range of humans is quite sensitive to the green region and even a tiny tonal variation can be discerned. The main obstacle is to obtain finely adjustable green emission with an emission range of 525–535 nm while keeping a <25 nm of the full width at half-maximum (FWHM). ,, Unfortunately, as a common commercial green-emitting phosphor, β-Sialon:Eu 2+ is not a suitable backlight display material because its FWHM is 55 nm and the PL peak is centered at 540 nm . Therefore, perovskite acts as a downconverter, and finding a new narrower green emitter is the main aim for backlighting light-emitting diodes (LEDs).…”

Section: Introductionmentioning

confidence: 99%

Dual-Protective CsPbX₃ Perovskite Nanocomposites with Improved Stability for Upconverted Lasing and Backlight Displays

Wang

Yao

et al. 2021

ACS Sustainable Chem. Eng.

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Recently, perovskite nanocrystals (NCs) have been recognized as a substitute for the conventional phosphor color converters, which can improve the color gamut and reproduction of liquid crystal displays (LCDs). However, the issue of instability has always been a stumbling block to practical applications. Here, a novel dual-phase mixed@glass@styrene−ethylene−butylene−styrene (SEBS) (MGS) nanocomposite is synthesized by three simple steps and the optimal photoluminescence quantum yield (PLQY) is 50%. Benefiting from the dual protection of the glass matrix and SEBS film re-encapsulation, the MGS composite shows typical bright green emission, significant improvement in water/ thermal/photon resistance, and environmental friendliness. Moreover, combining the as-prepared red emitter and the green-emitting MGS film with a blue InGaN chip as the backlight, an efficient white light-emitting diode (wLED) for backlights is fabricated. The gamut of the prepared LCD covers 131 and 97.7% National Television System Committee (NTSC) 1953 and Rec. 2020, respectively. In addition, random upconverted laser emission is achieved by low-power two-photon pumping. Hence, the dual-protective composite material with exceptional stability provides a feasible path for backlight display and upconverted lasing.

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Ultrastable glass-protected all-inorganic perovskite quantum dots with finely tunable green emissions for approaching Rec. 2020 backlit display

Cited by 77 publications

References 33 publications

Are substitutes to Cd-based quantum dots in displays more sustainable, effective, and cost competitive? An alternatives assessment approach

Are substitutes to Cd-based quantum dots in displays more sustainable, effective, and cost competitive? An alternatives assessment approach

Hole Transport Layer Free Perovskite Light-Emitting Diodes With High-Brightness and Air-Stability Based on Solution-Processed CsPbBr3-Cs4PbBr6 Composites Films

Dual-Protective CsPbX₃ Perovskite Nanocomposites with Improved Stability for Upconverted Lasing and Backlight Displays

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Ultrastable glass-protected all-inorganic perovskite quantum dots with finely tunable green emissions for approaching Rec. 2020 backlit display

Cited by 77 publications

References 33 publications

Are substitutes to Cd-based quantum dots in displays more sustainable, effective, and cost competitive? An alternatives assessment approach

Are substitutes to Cd-based quantum dots in displays more sustainable, effective, and cost competitive? An alternatives assessment approach

Hole Transport Layer Free Perovskite Light-Emitting Diodes With High-Brightness and Air-Stability Based on Solution-Processed CsPbBr3-Cs4PbBr6 Composites Films

Dual-Protective CsPbX3 Perovskite Nanocomposites with Improved Stability for Upconverted Lasing and Backlight Displays

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Dual-Protective CsPbX₃ Perovskite Nanocomposites with Improved Stability for Upconverted Lasing and Backlight Displays