Identification of a narrow band red light-emitting phosphor using computational screening of ICSD: Its synthesis and optical characterization

Kim, Minseuk; Singh, Satendra Pal; Lee, Jin Woong; Izawa, Takamasa; Kim, Do-Hoon; Yun, Bong-Goo; Yoon, Chang-Hwan; Park, Woon Bae; Sohn, Kee‐Sun

doi:10.1016/j.jallcom.2018.09.370

Cited by 13 publications

(11 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…18−20 However, such nitride phosphors are normally synthesized in oxygen-/waterfree glovebox and fired at high temperature and pressure, which are harsh and complex. 21 The UCr 4 C 4 -type oxide phosphors, called alkali lithosilicates phosphors, possess the advantages of excellent chemical stability, simple synthesis, low cost, and nontoxicity. The general chemical formula could be written as M(B 3 T)X 4 (M = Rb, Cs, K, Na, Li, etc.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In recent years, researchers have invested tremendous enthusiasm on the study of Eu 2+ -activated UCr 4 C 4 -type phosphors because of their excellent structural properties with highly symmetric cation sites and condensed framework. , These phosphors have a large degree of condensation (κ ≥ 0.5), which play important roles in realizing high color purity, luminescent efficiency, and thermal stability. For example, novel UCr 4 C 4 -type nitride phosphors such as Sr[LiAl 3 N 4 ]:Eu 2+ (SLA), Sr[Mg 3 SiN 4 ]:Eu 2+ (SMS), and Sr[Mg 2 Al 2 N 4 ]:Eu 2+ (SMA) were reported by Schnick’s group, and they present narrow emission, good luminescence efficiency, and excellent thermal stability. − However, such nitride phosphors are normally synthesized in oxygen-/water-free glovebox and fired at high temperature and pressure, which are harsh and complex . The UCr 4 C 4 -type oxide phosphors, called alkali lithosilicates phosphors, possess the advantages of excellent chemical stability, simple synthesis, low cost, and nontoxicity.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Photoluminescence Control of UCr₄C₄-Type Phosphors with Superior Luminous Efficiency and High Color Purity via Controlling Site Selection of Eu²⁺ Activators

et al. 2019

View full text Add to dashboard Cite

Controlling the site selection of activators via chemical substitution to optimize and design luminescence materials is an essential part of rare-earth-activated phosphors. Herein, we report the UCr4C4-type CsKNa2–y Li y (Li3SiO4)4:Eu2+ and CsKNa2(Li3Si1–z Ge z O4)4:Eu2+ phosphors, in which there are three crystallographic sites (Cs, K, and Na), and the site engineering for Eu2+ activators is utilized to tune the luminescence properties. First, Li+ ions are introduced to control the migration of Eu2+ ions from K sites to Na sites, realizing the spectral tuning from cyan narrow band [λem = 485 nm, full width at half-maximum (fwhm) = 27 nm] to green narrow band (λem = 526 nm, fwhm = 58 nm). Moreover, the variation of local lattice caused by Li+ ions improves the internal quantum yields from 39 to 82% as well as reduces the thermal quenching (90% @ 150 °C of integrated intensity at 20 °C). Second, the Ge4+ ions are introduced to control the shrinkage of the Na polyhedron for Eu2+ doping, leading to disappearance of the shoulder band in the green region. Simultaneously, the spectral blue shift should be ascribed to a synergistic effect of the reduction of crystal field splitting and Stokes shift. Thus, the blue-emitting CsKNa2(Li3GeO4)4:Eu2+ phosphor is obtained, which has only one symmetric blue emission at 458 nm with fwhm = 26 nm. By employing a 370 nm UV chip, the as-fabricated white light-emitting diodes using CsKNaLi(Li3SiO4)4:Eu2+ phosphor presents a superior luminous efficacy of 94.16 lm W–1, a corresponding color temperature of 5045 K, and a high color rendering index (95.8), demonstrating that the site engineering strategy based on the manipulation of chemical composition and crystal structure could be applied to tune spectral distribution and develop novel potential phosphors for practical optical application.

show abstract

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photoluminescence Control of UCr₄C₄-Type Phosphors with Superior Luminous Efficiency and High Color Purity via Controlling Site Selection of Eu²⁺ Activators

et al. 2019

View full text Add to dashboard Cite

show abstract

“…This method has been applied to search for novel phosphors and interpret relationship between the luminescence properties and material attributes [ 11–13 ]. Kim et al extracted K 2 Zn 6 O 7 , which has a cubic-like local structure, and 37 other kinds of crystal structures by screening the crystal structures in the Inorganic Crystal Structure Database (ICSD) under various conditions [ 13 ]. In addition, they developed a Sr 2 MgAl 5 N 7 :Eu 2+ narrow-band phosphor as an element substitute from K 2 Zn 6 O 7 .…”

Section: Introductionmentioning

confidence: 99%

“…Currently, an efficient approach by material informatics has been used to discover candidate materials from a large amount of data. This method has been applied to search for novel phosphors and interpret relationship between the luminescence properties and material attributes [11][12][13]. Kim et al extracted K 2 Zn 6 O 7 , which has a cubic-like local structure, and 37 other kinds of crystal structures by screening the crystal structures in the Inorganic Crystal Structure Database (ICSD) under various conditions [13].…”

mentioning

confidence: 99%

Dissimilarity measure of local structure in inorganic crystals using Wasserstein distance to search for novel phosphors

Takemura

Takeda

Nakanishi

et al. 2021

Science and Technology of Advanced Materials

View full text Add to dashboard Cite

To efficiently search for novel phosphors, we propose a dissimilarity measure of local structure using the Wasserstein distance. This simple and versatile method provides the quantitative dissimilarity of a local structure around a center ion. To calculate the Wasserstein distance, the local structures in crystals are numerically represented as a bag of interatomic distances. The Wasserstein distance is calculated for various ideal structures and local structures in known phosphors. The variation of the Wasserstein distance corresponds to the structural variation of the local structures, and the Wasserstein distance can quantitatively explain the dissimilarity of the local structures. The correlation between the Wasserstein distance and the full width at half maximum suggests that candidates for novel narrow-band phosphors can be identified by crystal structures that include local structures with small Wasserstein distances to local structures of known narrowband phosphors. The quantitative dissimilarity using the Wasserstein distance is useful in the search of novel phosphors and expected to be applied in materials searches in other fields in which local structures play an important role.

show abstract

“…Apparently, phosphors are an important influence on the light output and optical properties of pc-LEDs . In order to improve performance of pc-LEDs in general lighting and other special applications, many scientists are devoted to exploring new phosphors and promoting the performance of existing luminescence materials. − …”

Section: Introductionmentioning

confidence: 99%

Ca₈Mg₇Si₉N₂₂:Ce³⁺—A Yellow-Emitting Nitride Phosphor for White Light Emitting Diodes

Wang

Yang

et al. 2020

ACS Appl. Electron. Mater.

View full text Add to dashboard Cite

Nitridomagnesosilicate phosphors are promising candidates for white light emitting diodes. Here, we report a yellow nitride phosphor Ca 8 Mg 7 Si 9 N 22 :Ce 3+ , which exhibits a broad band emission in the spectral range of 475−675 nm under the excitation of 445 nm. The photoluminescence intensity of Ca 8−x Mg 7 Si 9 N 22 :xCe 3+ (0.01 ≤ x ≤ 0.11) reaches a maximum when x = 0.05. CIE coordinates and the color purity of Ca 7.95 Mg 7 Si 9 N 22 :0.05Ce 3+ are (0.449, 0.531) and 84.0%, respectively. The Ca 7.95 Mg 7 Si 9 N 22 :0.05Ce 3+ phosphor exhibits a good color drifting resistance with a maximum chromaticity shift of 0.0085 at 475 K. By combining the as-synthesized yellow nitride phosphor Ca 7.95 Mg 7 Si 9 N 22 :0.05Ce 3+ and red nitride phosphor SrLiAl 3 N 4 :Eu 2+ with a commercial blue InGaN chip, an all-nitride white light emitting diode device is fabricated, and a warm white light is generated with chromatic coordinates (0.471, 0.364) and color temperature of 2194 K.

show abstract

Identification of a narrow band red light-emitting phosphor using computational screening of ICSD: Its synthesis and optical characterization

Cited by 13 publications

References 41 publications

Photoluminescence Control of UCr₄C₄-Type Phosphors with Superior Luminous Efficiency and High Color Purity via Controlling Site Selection of Eu²⁺ Activators

Photoluminescence Control of UCr₄C₄-Type Phosphors with Superior Luminous Efficiency and High Color Purity via Controlling Site Selection of Eu²⁺ Activators

Dissimilarity measure of local structure in inorganic crystals using Wasserstein distance to search for novel phosphors

Ca₈Mg₇Si₉N₂₂:Ce³⁺—A Yellow-Emitting Nitride Phosphor for White Light Emitting Diodes

Contact Info

Product

Resources

About

Identification of a narrow band red light-emitting phosphor using computational screening of ICSD: Its synthesis and optical characterization

Cited by 13 publications

References 41 publications

Photoluminescence Control of UCr4C4-Type Phosphors with Superior Luminous Efficiency and High Color Purity via Controlling Site Selection of Eu2+ Activators

Photoluminescence Control of UCr4C4-Type Phosphors with Superior Luminous Efficiency and High Color Purity via Controlling Site Selection of Eu2+ Activators

Dissimilarity measure of local structure in inorganic crystals using Wasserstein distance to search for novel phosphors

Ca8Mg7Si9N22:Ce3+—A Yellow-Emitting Nitride Phosphor for White Light Emitting Diodes

Contact Info

Product

Resources

About

Photoluminescence Control of UCr₄C₄-Type Phosphors with Superior Luminous Efficiency and High Color Purity via Controlling Site Selection of Eu²⁺ Activators

Photoluminescence Control of UCr₄C₄-Type Phosphors with Superior Luminous Efficiency and High Color Purity via Controlling Site Selection of Eu²⁺ Activators

Ca₈Mg₇Si₉N₂₂:Ce³⁺—A Yellow-Emitting Nitride Phosphor for White Light Emitting Diodes