EU Emissions Research Articles

White afterglow achieved in Eu2+, Ce3+, Dy3+co-doped LiSr4(BO3)3 phosphor

In prior study by our team, orange-yellow afterglow was observed in Eu2+ and Dy3+ co-doped LiSr4(BO3 )3 phosphor due to the emission from Eu2+ center. In this study, further incorporation of Ce3+into the phosphor lead to the observation of white afterglow due to the mixed result of blue light from Ce3+ and orange-yellow light from Eu2+ centers. Upon ultraviolet excitation, the phosphor displays a spectrum characterized from blue emission of Ce3+ at 462nm and orange-yellow emission of Eu2+ at 632nm. Fine-tuning the concentration of Ce3+ enabled the realization of white luminescence in LiSr4(BO3)3: Eu2+, Ce3+ and Dy3+phosphor with chromaticity coordinates of (0.3979, 0.2939). The photoluminescence intensities of the samples could be modulated by incorporating varying amounts of Ce3+ ions, with a critical quenching concentration identified with 0.16 Ce3+. White afterglow is also observed after the removal of the light illumination due to the existence of suitable electron traps with optimal trap depth created by the co-doped Dy3+. The underlying mechanism proposes that the white afterglow is generated by the mixed lights of blue and orange-yellow that are created by the recombination of heat-released electrons from the trap centers with pre-existing holes in the Ce and Eu emission sites.

Spectral Investigation of Enhanced Orange Emission in Eu3+ Activated LaPO4 Nanophosphors Through Codoping With Na+ and Bi3+ Ions.

Lanthanum phosphate is a well-known potential host for rare earth activators for phosphor-converted white LED application. Na+ and Bi3+ codoped Eu3+ activated LaPO4 nanophosphor is successfully synthesized using citrate-based hydrothermal method at ambient condition and confirmed by XRD, EDS and XPS analysis. The excitation spectra of the sample exhibit sharp f-f characteristics peak of Eu3+ at 393 nm that is found to be the most dominant. The comparative photoluminescence studies of La1-xPO4:xEu3+(x = 0.10), La1-x-y PO4:xEu3+, yNa+(x = 0.10, y = 0.05), and La1-x-y-zPO4:xEu3+, yNa+, zBi3+ (x = 0.10, y = z = 0.05) reveal a progressive enhancement of the orange emission from Eu3+ as Na+ and (Na+, Bi3+) ions are incorporated into the LaPO4 matrix. The dominance of 5D0-7F1 magnetic dipole transition contributing a major part of orange luminescence of the nanophosphors and the symmetric site occupancy of Eu3+ was justified from the observed trend of in the Judd-Ofelt intensity parameters. The CIE studies confirm the improvement in color purity of emission from 32.5% to 90.6% due to the presence of Na+ and Bi3+ions.

Pollution Permits and Financing Costs

AbstractEffective environmental policy should consider how the financiers of polluting firms behave. We study phase III of the EU Emission Trading System. Loan spreads for cap‐and‐trade participants are a function of compliance costs, permit market features, and firms’ strategic actions. In contrast with the program intentions, we find that loan spreads fall by approximately 25%. We show that this decrease is almost entirely driven by low permit prices, the firms’ proactiveness to store permits, and imperfect foresight of market conditions in phase III. The drop in spreads cannot be explained by the decline in energy prices and/or other confounding factors.

The EU Emission Trading System Tax Regime and the Issue of Unfair Maritime Competition

The EU Emission Trading System Tax Regime and the Issue of Unfair Maritime Competition

INVESTIGATION OF FLUORESCENCE EFFECTS OF EU(TTA)3(H2O)2 AND EU(TTA)3(PHEN) COMPLEXES IN THE PRESENCE OF OTHER LANTHANIDE METAL IONS

In this study, we explore the fluorescence behavior of Eu(TTA)3(H2O)2 and Eu(TTA)3(Phen) complexes in the presence of various other lanthanide metal ions, with the objective of ensuring diversity in the raw material sources for military purposes. The fluorescence properties of these complexes are investigated to understand their potential interactions with other lanthanide ions and their effects on fluorescence emission. Spectroscopic analysis is conducted to examine how the presence of different lanthanide ions influences the fluorescence emission of Eu(TTA)3(H2O)2 and Eu(TTA)3(Phen) complexes. Product structure characteristics are determined by IR, UV-Vis, and EDX spectroscopy. The optical properties of the complex are studied by fluorescence spectroscopy. The results indicate that the structure EuxM1-x(TTA)Phen (M: Tb, Nd, Pr; x = 0.1; 0.5; 0.9; 1.0) gives stronger luminescence at ignited wavelengths λex = 385 nm.

Dissecting environmental efficiency: The role of technology adoption and usage

How could firms best reduce their environmental impact? Should they change technology? Or could they do better with what they already have? This paper shows that one size does not fit all. We analyse a sample of polluting production plants (i.e. installations) regulated under the EU Emission Trading System. We employ a mixture model estimation to dissect environmental efficiency into a technology adoption component (what type of technology is used) and a technology usage component (how a technology is used). Our installation-level analysis shows that the share of installations adopting frontier technologies is about 21%. We also find that the average environmental efficiency gains that installations could reach by improving technology adoption and technology usage are 75% and 80% respectively. The analysis of balance-sheet data on parent companies reveals that better environmental technologies are adopted by larger, listed, multi-installation and international companies, while older firms and firms with higher intangible assets intensity more commonly show improved technology usage.

Assessing the influence of actual LNG emission factors within the EU emissions trading system

The shipping sector has been incorporated into the European Union Emissions Trading System (EU-ETS). Undoubtedly, the carbon emission factor is a critical consideration when determining carbon allowances in the EU-ETS, known as EU Allowances (EUAs). In this study, an all-performance carbon emission test was conducted on a marine LNG engine to investigate the differences between the actual carbon emission factor and the reference value. It was observed that the actual carbon emission factor is smaller than the reference value. The test results indicate a discrepancy of approximately 3%, resulting in potential savings of 10,000 to 20,000 dollars in EUAs for a ship consuming 2000 tonnes of LNG fuel annually. Furthermore, variations in the carbon emission factor were observed under different engine operational conditions, fluctuating by around 2% at constant revolutions per minute (RPM). This suggests the need for more suitable emission testing methods to accurately reflect actual emissions and better achieve emission control goals.

Can't see the carbon for the CO2? Regulating CCU value chains under and beyond climate law

AbstractTo realise the objectives of the European Green Deal (EGD), fossil carbon will have to be not only reduced but also replaced with recycled carbon. The European Commission considers industrial carbon management and carbon capture and utilisation (CCU) technologies to be part of the solution. A value chain ensues when carbon dioxide (CO2) is captured and utilised as raw material. Examination of the climate, energy and environmental legal landscape of one specific CCU value chain—comprising of waste, waste incineration and plastic raw material—reveals the varied approaches regulation has towards CO2 and carbon. In this article, both carbon cycle legislation and legislation on the carbon source and the material storing carbon are analysed. The legislation being developed directly for CCU for products (other than synthetic fuels) focusses on the carbon cycle and CO2 under the EU emissions trading system (ETS) and a proposed Carbon Removal Certification Framework. Regulatory uncertainty remains for the studied CCU value chain as the capture of CO2 from waste incineration has yet to be incentivised under the EU ETS. Further, the criteria for the permanence of carbon storage in products to qualify under the EU ETS and of the long‐term storage under the Carbon Removal Certification Framework (CRCF) have yet to be developed. For a more complete understanding, we have also analysed waste and product regulations. The conceptual structure of the EU Waste Framework Directive does not seem to support circulating carbon. This context also raises the fundamental question of whether the purpose of waste incineration could be carbon recycling instead of mere energy production. Regarding material storing carbon, plastics, the regulator has been silent as CCU‐originated plastic raw material is not recognised in EU plastics law. These issues must be identified and resolved one by one before the EGD can be secured; revisiting only climate law instruments does not suffice.

Green syntheses of novel luminescent lanthanide compounds based on pentafluorobenzoate

Green syntheses employing aqueous solutions of lanthanide chloride, NaOH, and pentafluorobenzoic acid were successfully developed and produced pure dinuclear α-Ln compounds, [Ln(L)3(H2O)4]2·2H2O (L: pentafluorobenzoate) and new ones: η-Ln, Na[Ln(L)3(H2O)4]·L·2H2O, and θ-Ln, with Ln: Eu(III), Gd(III), and Tb(III). The synthesis becomes even greener when mechanochemistry is employed because it is quantitative, solvent-free, fast (30 min), and energy efficient. The θ-Ln compounds still have unknown composition and structure, so its description and properties are not explored. The η-Ln compounds are 1-D coordination polymer with only one bridging L, which leads to a large Ln···Ln distance (6.865 Å). Heteronuclear α-Ln0.50Ln0.50′ and η-LnxLn1−x′ compounds, with x = 0.05, 0.25, 0.50, and 0.75, Ln, Ln′: Eu, Tb, and Gd, have been synthesized by mixing the proper proportion of the lanthanide chlorides in the initial solution. The η-EuxTb1−x materials present Tb(III) → Eu(III) energy transfer, which confers interesting luminescent and photophysical properties with relevant potential applications. The color of the emission under UV irradiation can be tuned by the composition of the η-EuxTb1−x materials as well as by the excitation wavelength. In addition, it was observed a significant increase (ca. 35–260 %) of the D05 Eu(III) emission lifetime in the η-EuxTb1−x compounds by varying the excitation wavelength.

Towards Sustainable Strategies: Uncovering the Impact of Environmental Policies on Innovation Activities of Czech Firms

In recent years, there has been an increased emphasis on sustainable development worldwide, which has prompted governments to adopt environmental policies aimed at mitigating the adverse environmental impacts of economic activities. Among these strategies, the implementation of environmental policies has emerged as a key tool for promoting sustainable development. However, although these policies are created with good intentions, their impact on firms' innovation activities remains a matter of debate and research. The aim of this paper is to examine the impact of environmental policies on the innovation activities of Czech firms, with a particular focus on how these policies shape firms' strategies towards sustainable development. Given the growing emphasis on sustainability and environmental issues, it is necessary to examine how environmental policies can influence firms' overall innovation activities. 412 firms of different sizes were surveyed. And EU emissions trading and energy consumption emerged as the most influential variables with a positive impact.

Carbon market design and market sentiment

Concerns about systematic price distortions in the EU Emission Trading System (ETS) have risen in recent years. This paper shows how carbon-market design affects the impact of market sentiment, i.e. systematic deviations of price expectations from fundamentals by at least some market participants, on equilibrium prices. The Market Stability Reserve (MSR) of the EU ETS that adjusts supply based on past allowance banking undermines self-stabilization of the carbon market by discouraging rational intertemporal arbitrage. The MSR increases vulnerability of the EU ETS to market sentiments. Initially, the allowance price responds more to distorted expectations while the MSR (partially) prevents the distortion to spread across periods. Making the MSR more responsive to banking decisions increases the likelihood that distorted expectations turn out to be correct ex post. In contrast, a mechanism that adjust the cap based on the current allowance price does not face a trade off between stabilizing prices in the present and the future.

Hydroxyl-driven construction of dual-emitting CsPbBr3/EuWO4(OH) composite for radiometric thermometer and information encryption applications

Self-assembled inorganic metal halide perovskite composites with high emitting efficiency, tunable multimode emission and stimuli-responsive luminescence demonstrated great potential in diversified luminescence applications. Here, a novel CsPbBr3/EuWO4(OH) composite was successfully prepared through the surface adsorption of Pb2+ ions on hydroxylated EuWO4(OH) microsheets and subsequent nucleation of CsPbBr3 peroviskite quantum dots (PQDs) by the anti-solvent crystallization in CsBr containing N,N-dimethylformamide (DMF) solution. Due to the distinct fluorescent thermochromic switching properties of temperature-insensitive Eu3+ and sensitive CsPbBr3 PQDs emitting centers, the resultant CsPbBr3/EuWO4(OH) composite exhibits excellent ratiometric temperature sensing performance. The CsPbBr3/EuWO4(OH) thermometer based on the fluorescence intensity ratio (FIR) technique originating from emissions of Eu3+ to CsPbBr3 PQDs was then explored with a high temperature sensitivity (Sr) of 5.8 % ℃−1 at 54 ℃. In addition, a high-security-level information encryption scheme was proposed by utilizing the excitation-wavelength-dependent switchable fluorescence of CsPbBr3/EuWO4(OH) composite. This study provides a simple and feasible strategy for assembling dual-emission CsPbBr3/EuWO4(OH) composite, showing potential applications in optical ratiometric thermometry and information encryption fields.

Investigation of red-emitting CaMoO4: Eu3+ phosphor by partitioning of substitutional PO4 3- ions via solid-state reaction method.

To investigate the impact of PO4 3- anionic groups, the trivalent europium ion-doped calcium molybdate (CaMoO3-PO4:xEu3+, where x = 0.5, 1.0, 1.5, 2.0, and 2.5mol%) phosphors were synthesized using the solid-state reaction method. The detailed study of the phosphor materials was carried out by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), optical diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. The XRD results indicate that the substitution of PO4 3- anion and Eu3+ dopant ion did not affect the crystal structures of the CaMoO4 phosphors. Ultraviolet-visible (UV-vis) absorption analysis revealed the change of absorption edge of both un-doped and Eu3+-doped CaMoO4-PO4 phosphors. Under the 394 nm UV-excitation, the recorded PL spectra showed an intense peak at 615 nm corresponding to the Eu3+: 5D0 → 7F2 transition. The results of the Commission Internationale de l'Eclairage (CIE) diagram reported that the color of the emissions lies in the red color zone and there is no change in the CIE coordinates of the overall emission for Eu3+-doped CaMoO4-PO4 as Eu concentration changes. Thus, these observations led to finding the best red components for white light-emitting diode applications.

Does Speculation Matter in the Carbon Pricing Framework? Insights from the EU Emissions Trading System

To align with the global goal of keeping temperature below [Formula: see text]C, a market-based initiative, “Emissions Trading System” (ETS), has been developed to mitigate climate change. However, while the carbon allowances traded at the ETS are mostly held and traded by polluting companies, financial actors engage in “speculation”, activities that might be detrimental to the functioning of the ETS have also invested in the ETS. By drawing from the big data archive of Google Trends, we construct a news-based speculation index to proxy for the role of speculation in the dynamics of carbon pricing. Given our preliminary finding of inherent volatility and the mixed-frequency nature of the dataset, we employ the GARCH-MIDAS econometric technique to test the hypothesis that an all-inclusive framework that reflects the emission compliance and emissions non-compliance dynamics of the ETS is the most accurate approach to modeling carbon prices. We show that higher speculation in the ETS fosters higher long-term volatility in carbon prices, that speculation is a good predictor of carbon prices, and that its positive impact on carbon price returns makes the ETS an attractive investment opportunity. We provide a data-driven framework upon which the growing debate about whether the behavior of the non-compliance emission actors in the ETS endangers or benefits the functioning of the ETS can be evaluated empirically.

Does compensating firms for indirect carbon costs work? Evidence from Finnish manufacturing

The EU ETS indirect cost compensation subsidy was given out in the 2010s to compensate firms for increased electricity costs caused by the EU Emission Trading System, with the aim to support the competitiveness of producers in the EU. This paper studies the effects of the compensation subsidy on firm performance empirically with production plant level data from Finland. There is no clear evidence that the electricity costs have in fact been higher during the subsidy period, and the way that the subsidy was designed was not efficient. Perhaps for these reasons, the results find no indication of improved firm performance for the subsidy recipients.

EU Emissions Trading for Transport and Buildings: Saved by Synergistic Institutional Interaction?

EU Emissions Trading for Transport and Buildings: Saved by Synergistic Institutional Interaction?

Achieving the Anomalous Far‐Red Emission of Eu3+ by Tailoring Distorted Square Antiprism Symmetry in Potassium‐Bismuth‐Phosphates

Achieving the Anomalous Far‐Red Emission of Eu³⁺ by Tailoring Distorted Square Antiprism Symmetry in Potassium‐Bismuth‐Phosphates

Carbon Leakage Concept after Carbon Pricing & Green Deal Policies

As part of the European Green Deal, EU nations are required to decrease their carbon emissions by 55% by 2030 and reach carbon neutrality by 2050. The EU's emissions trading system is the cornerstone of this goal. In theory, rising carbon prices may cause carbon leakage, or the transfer of economic activity and related emissions from high-carbon economies to low-carbon economies. Losing market share to rivals in international rivalry might result in short-term international carbon leakage. In the long term, it can be accomplished by moving domestic businesses abroad. To date, a variety of tools, including offsets and free allowances granted under the ETS, have been used to support the carbon leakage risk of high-risk industries. This paper develops an international technique, the EU Emissions Trading Scheme (ETS) Phase IV consultation, to produce a sector-level risk assessment of carbon leakage in Türkiye. This methodology combines emissions intensity and trading intensity, two important indicators for assessing carbon leakage risk. Although the former is commonly employed as a measure of a company's exposure to carbon costs, the latter indicates its ability to pass on costs to customers without losing market share. According to the carbon risk study carried out in Türkiye for the aluminium, cement, paper, fertilizer, iron-steel, and ceramics sectors, cement has the highest risk, while paper carries the lowest risk

Has the EU Emissions Trading System Worked Properly?

Has the EU Emissions Trading System Worked Properly?

Facilitating a Sustainable Aviation Fuel Transition in Italy

Civil aviation significantly contributes to “hard-to-abate” emissions, responsible for 2% of global CO2 emissions. This paper examines the most effective policies to promote Sustainable Aviation Fuels (SAFs) in Italy, using a multi-level policy analysis and a stakeholder-based case study approach. The policies reviewed comprise the international, European, and national level. The paper analyses at the international level, ICAO CORSIA and, at the European level, the Renewable Energy Directive (RED), ReFuel EU, and the EU Emissions Trading System (EU ETS) for aviation. Italy has not yet implemented specific policies targeting SAF transition, which is challenging due to commercialization issues and policy inconsistencies. These include the price gap between SAF and conventional fuels, different definitions adopted, and environmental objectives pursued with respect to sustainable fuels by ICAO and the EU. Other challenges include double-counting risks and fuel tankering practices. This article contributes to Italy’s SAF policymaking by developing a stakeholder-based quantitative survey, whose results suggest that three measures are key: tax subsidies for technology and infrastructure users, tax credits for upgrading production infrastructure, and tax breaks for SAF-using companies, fuel handlers, and distributors.