Tetradic phosphor white light with variable CCT and superlative CRI through organolead halide perovskite nanocrystals

Adhikari, Gopi C.; Vargas, Preston; Zhu, Hongyang; Grigoriev, Alexei; Zhu, Peifen

doi:10.1039/c9na00125e

Cited by 36 publications

(21 citation statements)

References 68 publications

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“…Thus, this work stimulates us to study further about the applications of this technique. We proposed the tetradic phosphor technique to get white light by employing the four different color emitting NCs in conjunction with UV LED and succeed to observe a high value of CRI (up to 95.4) and LER (>300 lm·W −1 ) with tunable CCT from warm to cold hue 56,57 . The enhancement in the quality and optical property of light is attributed to the incorporation of an additional yellow phosphor component that bridges the energy gap between the green and red phosphor components.…”

Section: Resultsmentioning

confidence: 99%

Zn-Alloyed All-Inorganic Halide Perovskite-Based White Light-Emitting Diodes with Superior Color Quality

Thapa

Adhikari

Zhu

et al. 2019

Sci Rep

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Recently, lead halide perovskite nanocrystals (NCs) have gained tremendous attention in optoelectronic devices due to their excellent optical properties. However, the toxicity of lead limits their practical applications. Here, the synthesis of Zn2+-alloyed CsZnxPb1-xX3 (up to 15%) NCs is reported to achieve lead-reduced white light-emitting diodes (WLEDs). The incorporation of Zn2+ into CsPbX3 host NCs results in a lattice contraction, without altering the structure and morphology, which has a direct effect on the optical properties. The blue-shifts in the photoluminescence emission and increase in bandgap is observed while retaining high photoluminescence quantum yield. Then by engineering the different compositions of halides for 15% Zn2+-alloyed CsZnxPb1-xX3 NCs, tunable emission (411–636 nm) is obtained. Notably, the WLEDs are experimentally demonstrated employing the lead-reduced NCs (blue, green, yellow, and red). By varying the ratios of the amount of NCs, white lights with a tunable correlated-color temperature (2218–8335 K), an exemplary color-rendering index (up to 93) and high luminous efficacy of radiation (268–318 lm·W−1) are obtained. Best of our knowledge, these are superior to other reported WLEDs based on CsPbX3 NCs doped with transition metal ions. This work places the halide perovskite NCs one-step closer in designing the environmentally benign and energy-efficient WLEDs.

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Section: Resultsmentioning

confidence: 99%

Zn-Alloyed All-Inorganic Halide Perovskite-Based White Light-Emitting Diodes with Superior Color Quality

Thapa

Adhikari

Zhu

et al. 2019

Sci Rep

Self Cite

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“…We fitted the main PL peak using the Gaussian distribution and measured the full width at half maximum (FWHM) on both films to check the color purity. The FWHM of the main peak of ( [40,41]. We also measured the Stokes shift in these perovskites to probe the energy loss through molecular vibrations.…”

Section: Resultsmentioning

confidence: 99%

Impact of Dimensionality on Optoelectronic Properties of Hybrid Perovskites

Ware

Wright

Davita³

et al. 2021

International Journal of Photoenergy

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Organometal halides are promising materials for photovoltaic applications, offering tunable electronic levels, excellent charge transport, and simplicity of thin-film device fabrication. Two-dimensional (2D) perovskites have emerged as promising candidates over three-dimensional (3D) ones due to their interesting optical and electrical properties. However, maximizing the power conversion efficiency is a critical issue to improve the performance of these solar cells. In this work, we studied the photophysics of a two-dimensional (2D) perovskite (CH3NH3)2Pb(SCN)2I2 thin film using steady-state and time-resolved absorption and emission spectroscopy and compared it with the three-dimensional (3D) counterpart CH3NH3PbI3. We observed a higher bandgap and faster charge recombination in (CH3NH3)2Pb(SCN)2I2 compared to CH3NH3PbI3. This work provides an improved understanding of fundamental photophysical processes in perovskite structures and provides the guideline for the design, synthesis, and fabrication of solar cells.

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“…In the context of modern environmental and climatic challenges, the use of renewable energy resources can become an effective solution to many local energy problems, such as using solid-state lighting instead of traditional lighting technologies [13][14][15].…”

Section: Literature Reviewmentioning

confidence: 99%

“…Justification of the maximum level of development of enterprises, introduction of an environmentally safe structure of enterprises, territorial restrictions of economic activity, up to a complete ban SDG 6,9,11,12,13,14,15,17 In many countries that have Arctic territories in their composition, a ban on the use of diesel fuel has already appeared. For example, the territories of Alaska completely abandoned its use, replacing it with RES.…”

Section: Rapid Development Of Mining and Industrial Production Enterprisesmentioning

confidence: 99%

Potential Impact of Renewable Energy on the Sustainable Development of Russian Arctic Territories

2021

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In recent decades, there has been a positive trend in world politics in the field of promoting territories’ sustainable development. At the same time, one of the most relevant areas is to promote the transition to renewable energy sources (RES), which correspond to one of the UN’s goals—Sustainable Development Goal 7 (SDG 7) “Ensuring universal access to affordable, reliable, sustainable and modern energy sources for all”. This article is devoted to the study of the renewable energy sources’ impact on the sustainable development of the Russian Arctic zone. The authors chose the level of carbon dioxide (CO2) emissions as an indicator reflecting the impact of RES on sustainable development, since this factor is one of the main factors for assessing trends in the activities of countries aimed at achieving progress on most of the Sustainable Development Goals of territories. The hypothesis of the relationship between the use of renewable energy sources and the achievement of progress on the Sustainable Development Goals, one of the indicators of which is the level of CO2 emissions, was tested and confirmed. An econometric analysis of panel data for 15 countries that are actively implementing the concept of sustainable development, including decarbonizing policies, was carried out ,where the resulting indicator for achieving progress on the SDG was the amount of CO2 emissions. The factors influencing the resulting variable were indicators selected based on a review of existing models, as well as indicators of the Sustainable Development Goals’ achievement. Using an econometric analysis of interdependence, the indicators of progress towards the Sustainable Development Goals that are more likely to have an impact on the level of CO2 emissions were identified. These are electricity consumption, the share of renewable energy sources in the energy balance, the average per capita income of the population, and carbon intensity. Based on the results obtained, it can be concluded that renewable energy sources are a factor contributing to the achievement of progress on the Sustainable Development Goals. The results obtained are also applicable to the Arctic region, since all countries that have territories in the Arctic zone adhere to the policy of decarbonization and try to reduce the use of fossil fuels.

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Tetradic phosphor white light with variable CCT and superlative CRI through organolead halide perovskite nanocrystals

Cited by 36 publications

References 68 publications

Zn-Alloyed All-Inorganic Halide Perovskite-Based White Light-Emitting Diodes with Superior Color Quality

Zn-Alloyed All-Inorganic Halide Perovskite-Based White Light-Emitting Diodes with Superior Color Quality

Impact of Dimensionality on Optoelectronic Properties of Hybrid Perovskites

Potential Impact of Renewable Energy on the Sustainable Development of Russian Arctic Territories

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