Aluminate Red Phosphor in Light-Emitting Diodes: Theoretical Calculations, Charge Varieties, and High-Pressure Luminescence Analysis

Zhang, Niumiao; Tsai, Yi‐Lin; Fang, Mu‐Huai; Ma, Chensheng; Lazarowska, Agata; Mahlik, Sebastian; Chiang, Cheng-Yen; Zhou, Wuzong; Lin, J. G.; Lee, Jyh‐Fu; Zheng, Jiming; Guo, Chongfeng; Liu, Ru‐Shi

doi:10.1021/acsami.7b06840

Cited by 49 publications

(32 citation statements)

References 52 publications

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“…It is worth noting that the pattern observed on the 1100 °C sample ( Figure S6b ) affirms that the created crystal system is orthorhombic. 29 The representative TEM images for SAO codoped with Mn 4+ and Tb 3+ ions annealed at 1000 °C are shown in Figure S8 . The histograms for SAO:Mn 4+ ( Figure 1 d,f,h,j for 800, 900, 1000, 1100 °C, respectively) indicate that the average grain size increases with the annealing temperatures from 800 to 1100 °C as follows: 32, 45, 90, and 140 nm, respectively.…”

Section: Results and Discussionmentioning

confidence: 99%

Thermochromic Luminescent Nanomaterials Based on Mn⁴⁺/Tb³⁺ Codoping for Temperature Imaging with Digital Cameras

Piotrowski

Trejgis

Maciejewska

et al. 2020

ACS Appl. Mater. Interfaces

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A new thermographic nanocrystalline Sr 4 Al 14 O 25 :Mn 4+ ,Tb 3+ phosphor was developed, and the concentrations of both dopants and the synthesis conditions were optimized. The combination of the thermally quenched luminescence from the Mn 4+ ions to the almost temperature-independent emission from Tb 3+ provides a sensitive luminescent thermometer ( S R = 2.8%/°C at 150 °C) with strong emission color variability. In addition, a figure of merit for this luminescence thermochromism was proposed, as the relative sensitivities of the x and y CIE coordinates, which for this phosphor reaches at 150 °C S R ( x ) = 0.6%/°C and S R ( y ) = 0.4%/°C, respectively. Noncontact thermal imaging was demonstrated with this phosphor using a single consumer digital camera and exploiting the ratio of red (R) and green (G) channels of the RGB images, thereby confirming the high application potential of Sr 4 Al 14 O 25 :Mn 4+ ,Tb 3+ nanocrystals for thermal sensing and mapping.

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Section: Results and Discussionmentioning

confidence: 99%

Thermochromic Luminescent Nanomaterials Based on Mn⁴⁺/Tb³⁺ Codoping for Temperature Imaging with Digital Cameras

Piotrowski

Trejgis

Maciejewska

et al. 2020

ACS Appl. Mater. Interfaces

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“…White light‐emitting diodes (LEDs) have attracted considerable attention as promising next‐generation solid‐state lighting devices because of their superior properties, including their small size, high efficiency, energy savings, long lifetime, and environmental properties . Currently, the majority of commercially available white LEDs are based on the use of 2 different types of devices that employ different electroluminescent materials.…”

Section: Introductionmentioning

confidence: 99%

A novel dazzling Eu³⁺‐doped whitlockite‐type phosphate red‐emitting phosphor for white light‐emitting diodes

Tang

Zheng

et al. 2018

J Am Ceram Soc

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A series of novel red‐emitting Ca8ZnLa1−xEux(PO4)7 phosphors were successfully synthesized using the high‐temperature solid‐state reaction method. The crystal structure, photoluminescence spectra, thermal stability, and quantum efficiency of the phosphors were investigated as a function of Eu3+ concentration. Detailed analysis of their structural properties revealed that all the phosphors could be assigned as whitlockite‐type β‐Ca3(PO4)2 structures. Both the PL emission spectra and decay curves suggest that emission intensity is largely dependent on Eu3+ concentration, with no quenching as the Eu3+ concentration approaches 100%. A dominant red emission band centered at 611 nm indicates that Eu3+ occupies a low symmetry sites within the Ca8ZnLa(PO4)7 host lattice, which was confirm by Judd‐Ofelt theory. Ca8ZnLa1−xEux(PO4)7 phosphors exhibited good color coordinates (0.6516, 0.3480), high color purity (~96.3%), and high quantum efficiency (~78%). Temperature‐dependent emission spectra showed that the phosphors possessed good thermal stability. A white light‐emitting diode (LED) device were fabricated by integrating a mixture of obtained phosphors, commercial green‐emitting and blue‐emitting phosphors into a near‐ultraviolet LED chip. The fabricated white LED device emits glaring white light with high color rendering index (83.9) and proper correlated color temperature (5570 K). These results demonstrate that the Ca8ZnLa1−xEux(PO4)7 phosphors are a promising candidate for solid‐state lighting.

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“…The application of pressure is one of the state parameters that can change the peak energy and 10Dq by reducing the inter-atomic distances. Studies of the Mn 4+ optical properties under external pressure have been reported in the archival literature [13][14][15]. The goal of this study was to quantitatively explore by first-principles calculations within density functional theory, the electronic, elastic and optical properties of K 2 SiF 6 in the absence and presence of the activator ion (Mn 4+ ).…”

Section: Introductionmentioning

confidence: 99%

Influence of Isostatic Pressure on the Elastic and Electronic Properties of K2SiF6:Mn4+

Subhoni

Zafari

et al. 2022

Materials

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Isostatic pressure effects on the elastic and electronic properties of non-doped and Mn4+-doped K2SiF6 (KSF) have been investigated by first-principles calculations within density functional theory (DFT). Bulk modulus was obtained by the Murnaghan’s equation of states (EOS) using the relationship between volume and pressures at pressures between 0 and 40 GPa, and elastic constants were calculated by the stress–strain relationship giving small distortions at each pressure point. The other elastic parameters such as shear modulus, sound velocity and Debye temperature, which can be obtained from the elastic constants, were also estimated. The influence of external isostatic pressure on the electronic properties, such as crystal field strength 10Dq and emission energy of 2E → 4A2 transition (Eem), of KSF:Mn4+ was also studied. The results suggest that 10Dq and Eem linearly increase and decrease, respectively, with increasing pressure.

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Aluminate Red Phosphor in Light-Emitting Diodes: Theoretical Calculations, Charge Varieties, and High-Pressure Luminescence Analysis

Cited by 49 publications

References 52 publications

Thermochromic Luminescent Nanomaterials Based on Mn⁴⁺/Tb³⁺ Codoping for Temperature Imaging with Digital Cameras

Thermochromic Luminescent Nanomaterials Based on Mn⁴⁺/Tb³⁺ Codoping for Temperature Imaging with Digital Cameras

A novel dazzling Eu³⁺‐doped whitlockite‐type phosphate red‐emitting phosphor for white light‐emitting diodes

Influence of Isostatic Pressure on the Elastic and Electronic Properties of K2SiF6:Mn4+

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Aluminate Red Phosphor in Light-Emitting Diodes: Theoretical Calculations, Charge Varieties, and High-Pressure Luminescence Analysis

Cited by 49 publications

References 52 publications

Thermochromic Luminescent Nanomaterials Based on Mn4+/Tb3+ Codoping for Temperature Imaging with Digital Cameras

Thermochromic Luminescent Nanomaterials Based on Mn4+/Tb3+ Codoping for Temperature Imaging with Digital Cameras

A novel dazzling Eu3+‐doped whitlockite‐type phosphate red‐emitting phosphor for white light‐emitting diodes

Influence of Isostatic Pressure on the Elastic and Electronic Properties of K2SiF6:Mn4+

Contact Info

Product

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About

Thermochromic Luminescent Nanomaterials Based on Mn⁴⁺/Tb³⁺ Codoping for Temperature Imaging with Digital Cameras

Thermochromic Luminescent Nanomaterials Based on Mn⁴⁺/Tb³⁺ Codoping for Temperature Imaging with Digital Cameras

A novel dazzling Eu³⁺‐doped whitlockite‐type phosphate red‐emitting phosphor for white light‐emitting diodes