A zero-thermal-quenching phosphor

Kim, Yoon Hwa; Arunkumar, Paulraj; Kim, Bo Young; Unithrattil, Sanjith; Kim, Eden; Moon, Su Hyun; Hyun, Jae Young; Kim, Ki‐Hyun; Lee, Donghwa; Lee, Jong‐Sook

doi:10.1038/nmat4843

Cited by 768 publications

(479 citation statements)

References 38 publications

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“…phosphor 42 . High PL QY has been reported in perovskite colloids by employing ligands to stabilize the nanocrystals 1,43 , and thin films (solids) of micron-sized grains 44,45 .…”

Section: Resultsmentioning

confidence: 99%

Probing molecule-like isolated octahedra via phase stabilization of zero-dimensional cesium lead halide nanocrystals

et al. 2018

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Zero-dimensional (0D) inorganic perovskites have recently emerged as an interesting class of material owing to their intrinsic Pb2+ emission, polaron formation, and large exciton binding energy. They have a unique quantum-confined structure, originating from the complete isolation of octahedra exhibiting single-molecule behavior. Herein, we probe the optical behavior of single-molecule-like isolated octahedra in 0D Cesium lead halide (Cs4PbX6, X = Cl, Br/Cl, Br) nanocrystals through isovalent manganese doping at lead sites. The incorporation of manganese induced phase stabilization of 0D Cs4PbX6 over CsPbX3 by lowering the symmetry of PbX6 via enhanced octahedral distortion. This approach enables the synthesis of CsPbX3 free Cs4PbX6 nanocrystals. A high photoluminescence quantum yield for manganese emission was obtained in colloidal (29%) and solid (21%, powder) forms. These performances can be attributed to structure-induced confinement effects, which enhance the energy transfer from localized host exciton states to Mn2+ dopant within the isolated octahedra.

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“…phosphor 42 . High PL QY has been reported in perovskite colloids by employing ligands to stabilize the nanocrystals 1,43 , and thin films (solids) of micron-sized grains 44,45 .…”

Section: Resultsmentioning

confidence: 99%

Probing molecule-like isolated octahedra via phase stabilization of zero-dimensional cesium lead halide nanocrystals

et al. 2018

Self Cite

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“…Unfortunately, only a handful of the phosphors currently reported in the literature are able to perform the down-conversion process efficiently, as measured by the photoluminescent quantum yield ( Φ ) 10 . Even then, some of the phosphors with a high luminescence quantum efficiency also suffer from thermal quenching, where the optical properties, for example, emission wavelength and intensity, change at elevated temperature limiting their range of potential applications 11–15 . Therefore, the continued improvement of LED-based lighting requires the discovery of new efficient and thermally robust rare-earth substituted inorganic phosphors.…”

Section: Introductionmentioning

confidence: 99%

Identifying an efficient, thermally robust inorganic phosphor host via machine learning

Zhuo¹,

Tehrani²,

Oliynyk³

et al. 2018

Nat Commun

248

167

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Rare-earth substituted inorganic phosphors are critical for solid state lighting. New phosphors are traditionally identified through chemical intuition or trial and error synthesis, inhibiting the discovery of potential high-performance materials. Here, we merge a support vector machine regression model to predict a phosphor host crystal structure’s Debye temperature, which is a proxy for photoluminescent quantum yield, with high-throughput density functional theory calculations to evaluate the band gap. This platform allows the identification of phosphors that may have otherwise been overlooked. Among the compounds with the highest Debye temperature and largest band gap, NaBaB9O15 shows outstanding potential. Following its synthesis and structural characterization, the structural rigidity is confirmed to stem from a unique corner sharing [B3O7]5– polyanionic backbone. Substituting this material with Eu2+ yields UV excitation bands and a narrow violet emission at 416 nm with a full-width at half-maximum of 34.5 nm. More importantly, NaBaB9O15:Eu2+ possesses a quantum yield of 95% and excellent thermal stability.

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“…White light-emitting diodes (W-LEDs) are considered as the next-generation solid-state lighting system due to the high luminous efficiency, long operation time, reliability environmental friendliness [1,2,3]. The traditional way used to obtain white light is combing blue InGaN LEDs chip with the yellow phosphor Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce 3+ ).…”

Section: Introductionmentioning

confidence: 99%

The Enhanced Red Emission and Improved Thermal Stability of CaAlSiN3:Eu2+ Phosphors by Using Nano-EuB6 as Raw Material

Liu

Chang

et al. 2018

Nanomaterials

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Synthesizing phosphors with high performance is still a necessary work for phosphor-converted white light-emitting diodes (W-LEDs). In this paper, three series of CaAlSiN3:Eu2+ (denoted as CASN:Eu2+) phosphors using Eu2O3, EuN and EuB6 as raw materials respectively are fabricated by under the alloy precursor normal pressure nitridation synthesis condition. We demonstrate that CASN:Eu2+ using nano-EuB6 as raw material shows higher emission intensity than others, which is ascribed to the increment of Eu2+ ionic content entering into the crystal lattice. An improved thermal stability can also be obtained by using nano-EuB6 due to the structurally stable status, which is assigned to the partial substitution of Eu–O (Eu–N) bonds by more covalent Eu–B ones that leads to a higher structural rigidity. In addition, the W-LEDs lamp was fabricated to explore its possible application in W-LEDs based on blue LEDs. Our results indicate that using EuB6 as raw materials can provide an effective way of enhancing the red emission and improving the thermal stability of the CASN:Eu2+ red phosphor.

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A zero-thermal-quenching phosphor

Cited by 768 publications

References 38 publications

Probing molecule-like isolated octahedra via phase stabilization of zero-dimensional cesium lead halide nanocrystals

Probing molecule-like isolated octahedra via phase stabilization of zero-dimensional cesium lead halide nanocrystals

Identifying an efficient, thermally robust inorganic phosphor host via machine learning

The Enhanced Red Emission and Improved Thermal Stability of CaAlSiN3:Eu2+ Phosphors by Using Nano-EuB6 as Raw Material

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