Control of Eu Oxidation State in Y2O3−xSx:Eu Thin-Film Phosphors Prepared by Atomic Layer Deposition: A Structural and Photoluminescence Study

Rosa, José; Deuermeier, Jonas; Soininen, P.; Bosund, Markus; Zhu, Zhen; Fortunato, Elvira; Martins, Rodrigo; Sugiyama, Mutsumi; Merdes, S.

doi:10.3390/ma13010093

Cited by 5 publications

(5 citation statements)

References 29 publications

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“…Note that, Eu(thd) 3 is pulsed into the ALD reactor chamber after an O 3 pulse. In a previous study it was stated that Eu may be more reactive towards the H 2 S in comparison to ozone, and thus increasing the doping level [14]. However, in the present study, the surface has an oxygen monolayer instead of a sulfur monolayer, prior to the Eu(thd) 3 pulse.…”

Section: Discussionmentioning

confidence: 57%

“…These data are supported by the detection of CaCO 3 component in Figure 3b and higher carbon concentration shown in Table 2. The carbon contamination in CaS:EuO could be explained by the reaction between ozone and the β-diketonate precursor (Eu(thd) 3 ), which is known to originate carbonates in the films [14]. Additionally, the ToF-ERDA analysis revealed a lower hydrogen presence in CaS:Eu, which indicates the excellent reactivity between Ca(thd) 2 and Eu(thd) 3 with H 2 S. These efficient surface reactions are responsible to effectively remove lighter species, such as H [36].…”

Section: Discussionmentioning

confidence: 99%

“…A good example of ALD multi-anion research applied to luminescent materials is a previous study on the control europium of the oxidation state in a Y 2 O 3−x S X matrix [14]. In this research, it was demonstrated that the oxidation state of Eu luminescent center could be changed by the introduction of Eu atoms with an ALD sub cycle of two different anion precursors: either H 2 S or O 3 .…”

Section: Introductionmentioning

confidence: 92%

“…As a result, the research of single-anion (homo-anionic) compounds, such as pure metal oxides, pnictides (nitrides, arsenides, phosphides) or chalcogenides (sulfides, selenides, tellurides), has given place to a mixed anion-centered (multi-anion or hetero-anionic) compounds research [9]. Mixed anion centered materials include for example carbonitrides [10], oxyfluorides [11], oxynitrides [12], oxycarbides [13], and oxysulfides [14]. The ability to incorporate different types of anions allows to change a variety of material properties and characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Tuning of Emission Wavelength of CaS:Eu by Addition of Oxygen Using Atomic Layer Deposition

et al. 2021

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Atomic layer deposition (ALD) technology has unlocked new ways of manipulating the growth of inorganic materials. The fine control at the atomic level allowed by ALD technology creates the perfect conditions for the inclusion of new cationic or anionic elements of the already-known materials. Consequently, novel material characteristics may arise with new functions for applications. This is especially relevant for inorganic luminescent materials where slight changes in the vicinity of the luminescent centers may originate new emission properties. Here, we studied the luminescent properties of CaS:Eu by introducing europium with oxygen ions by ALD, resulting in a novel CaS:EuO thin film. We study structural and photoluminescent properties of two different ALD deposited Eu doped CaS thin films: Eu(thd)3 which reacted with H2S forming CaS:Eu phosphor, or with O3 originating a CaS:EuO phosphor. It was found that the emission wavelength of CaS:EuO was 625.8 nm whereas CaS:Eu was 647 nm. Thus, the inclusion of O2- ions by ALD in a CaS:Eu phosphor results in the blue-shift of 21.2 nm. Our results show that ALD can be an effective way to introduce additional elements (e.g., anionic elements) to engineer the physical properties (e.g., inorganic phosphor emissions) for photonics and optoelectronics.

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Section: Discussionmentioning

confidence: 57%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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Tuning of Emission Wavelength of CaS:Eu by Addition of Oxygen Using Atomic Layer Deposition

et al. 2021

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“…In a previous paper, we reported the growth of blue and red Y 2 O 3-x S x :Eu phosphors by ALD [ 33 ]. In this work, we focus on the fabrication and the performance evaluation of Y 2 O 3 :Eu-based multilayer structure electroluminescent devices that can potentially be used in red transparent display applications.…”

Section: Introductionmentioning

confidence: 99%

Red Y2O3:Eu-Based Electroluminescent Device Prepared by Atomic Layer Deposition for Transparent Display Applications

et al. 2021

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Y2O3:Eu is a promising red-emitting phosphor owing to its high luminance efficiency, chemical stability, and non-toxicity. Although Y2O3:Eu thin films can be prepared by various deposition methods, most of them require high processing temperatures in order to obtain a crystalline structure. In this work, we report on the fabrication of red Y2O3:Eu thin film phosphors and multilayer structure Y2O3:Eu-based electroluminescent devices by atomic layer deposition at 300 °C. The structural and optical properties of the phosphor films were investigated using X-ray diffraction and photoluminescence measurements, respectively, whereas the performance of the fabricated device was evaluated using electroluminescence measurements. X-ray diffraction measurements show a polycrystalline structure of the films whereas photoluminescence shows emission above 570 nm. Red electroluminescent devices with a luminance up to 40 cd/m2 at a driving frequency of 1 kHz and an efficiency of 0.28 Lm/W were achieved.

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Mixed‐Anion Compounds: An Unexplored Playground for ALD Fabrication

Tripathi

Karppinen

2021

Adv Materials Inter

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For decades the most successful approach towards new inorganic material innovations for next‐generation devices has been to manipulate the cation composition. As this cation‐centric material development is inevitably approaching its saturation, new chemistries are needed to maintain the pace of technological progress. One of the new chemistry approaches is to play with the anions instead of the cations. Moreover, advances in fabrication techniques are needed to address the endeavors to shrink the device and component dimensions. Here, the combination of mixed‐anion chemistries, such as oxychalcogenides or carbopnictides, and the state‐of‐the‐art atomic layer deposition (ALD) thin‐film technology are highlighted. The unique bottom‐up material building mode of ALD can lead to scientifically exciting but at the same time industry‐feasible material innovations. In this brief review, the present status and prospects, and the challenges of this emerging field are discussed.

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Control of Eu Oxidation State in Y2O3−xSx:Eu Thin-Film Phosphors Prepared by Atomic Layer Deposition: A Structural and Photoluminescence Study

Cited by 5 publications

References 29 publications

Tuning of Emission Wavelength of CaS:Eu by Addition of Oxygen Using Atomic Layer Deposition

Tuning of Emission Wavelength of CaS:Eu by Addition of Oxygen Using Atomic Layer Deposition

Red Y2O3:Eu-Based Electroluminescent Device Prepared by Atomic Layer Deposition for Transparent Display Applications

Mixed‐Anion Compounds: An Unexplored Playground for ALD Fabrication

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