Recent progress in luminescence tuning of Ce<sup>3+</sup>and Eu<sup>2+</sup>-activated phosphors for pc-WLEDs

Li, Guogang; Tian, Ying; Zhao, Yun; Lin, Jun

doi:10.1039/c4cs00446a

Cited by 812 publications

(446 citation statements)

References 169 publications

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“…and Eu 2? doped phosphors [195]. These strategies were successfully employed in the tailoring of novel phosphors for wLEDs, as shown in recent papers [196][197][198].…”

Section: Discussionmentioning

confidence: 98%

Inorganic Phosphor Materials for Lighting

2016

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This chapter addresses the development of inorganic phosphor materials capable of converting the near UV or blue radiation emitted by a light emitting diode to visible radiation that can be suitably combined to yield white light. These materials are at the core of the new generation of solid-state lighting devices that are emerging as a crucial clean and energy saving technology. The chapter introduces the problem of white light generation using inorganic phosphors and the structureproperty relationships in the broad class of phosphor materials, normally containing lanthanide or transition metal ions as dopants. Radiative and non-radiative relaxation mechanisms are briefly described. Phosphors emitting light of different colors (yellow, blue, green, and red) are described and reviewed, classifying them in different chemical families of the host (silicates, phosphates, aluminates, borates, and non-oxide hosts). This research field has grown rapidly and is still growing, but the discovery of new phosphor materials with optimized properties (in terms of emission efficiency, chemical and thermal stability, color, purity, and cost of fabrication) would still be of the utmost importance.

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“…and Eu 2? doped phosphors [195]. These strategies were successfully employed in the tailoring of novel phosphors for wLEDs, as shown in recent papers [196][197][198].…”

Section: Discussionmentioning

confidence: 98%

Inorganic Phosphor Materials for Lighting

2016

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“…Recently, luminescence-based techniques have continued to attract considerable attention because of their wide potential in the fields of optical devices and biomedicine, such as displays, immunoassays, and anticounterfeiting [2][3][4]. In particular, luminescent inorganic nanomaterials have attracted considerable interest because of their tremendous potential applications and for fundamental science research in many fields [5].…”

Section: Introductionmentioning

confidence: 99%

Pt/Y2O3:Eu3+ composite nanotubes: Enhanced photoluminescence and application in dye-sensitized solar cells

Wang

et al. 2016

Nano Res.

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Y(OH) 3 :Eu 3+ nanotubes were synthesized using a facile hydrothermal method, and then, Pt particles were grown on the surface of the nanotubes using a combination of vacuum extraction and annealing. The resulting Pt/Y 2 O 3 :Eu 3+ composite nanotubes not only exhibited enhanced red luminescence under 255-or 468-nm excitation but could also be used to improve the efficiency of dyesensitized solar cells, resulting in an efficiency of 8.33%, which represents a significant enhancement of 11.96% compared with a solar cell without the composite nanotubes. Electrochemical impedance spectroscopy results indicated that the interfacial resistance of the TiO 2 -dye|I 3 -/I -electrolyte interface of the TiO 2 -Pt/Y 2 O 3 :Eu 3+ composite cell was much smaller than that of a pure TiO2 cell. In addition, the TiO 2 -Pt/Y 2 O 3 :Eu 3+ composite cell exhibited a shorter electron transport time and longer electron recombination time than the pure TiO 2 cell.

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“…The magnitude of the crystal field splitting is related to the activator-anion local geometry, which can be described by the average bond length (l av ) and distortion index (D) of the activator-anion polyhedral. 35,36 Shorter l av and higher D typically lead to a larger splitting. Both l av and D increase with increasing z at constant Eu 2+ concentration (y value).…”

Section: β-Sialon:eumentioning

confidence: 99%

Critical Review—Narrow-Band Nitride Phosphors for Wide Color-Gamut White LED Backlighting

Xie

Takeda

et al. 2017

ECS J. Solid State Sci. Technol.

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To achieve a brilliant image with high color saturation in white LED backlighting technology, innovative phosphor materials with narrow-band emission in the green and red spectral region are continuously pursed. Nitride phosphors are so far accepted as the most suitable phosphors for white LED backlights due to their high efficiency and excellent robustness. In this perspective, we will present an overview about the recent developments of state-of-the-art and newly-emerging nitride phosphors with a narrow emission band, and the emphasis would be placed on the relationships between the crystal structure and luminescence properties. Finally, some empirical rules for designing novel narrow-band phosphors for backlighting technologies would be summarized. Nowadays, liquid crystal displays (LCDs) are ubiquitous in our daily lives, and their applications range from smartphones, tablets, computers, to large-screen TVs, and data projectors. As there is much concern on backlight units with larger color gamut, higher brightness, lower power consumption and mercury-free, white light-emitting diodes (LEDs) have been widely applied as backlighting components in modern LCD technologies to replace the traditional cold cathodefluorescence lamps (CCFLs). 1-12Multi-chip white LEDs, which comprise red-, green-and blueemitting chips, exhibit excellent color performance and tuning abilities. However, the efficiencies of red, green, and blue LEDs vary overtime at different rates. In addition, separated driving circuits and complicated feedback-driven systems are required, which leads to a high cost. Moreover, the efficiency of green LEDs, known as "green gap", is much smaller than that of red and blue ones.13-15 By contrast, phosphor-converted (pc) white LED backlights, which combine a single LED chip with phosphor materials, are mostly used due to their high efficiency, cost effectiveness and robustness. To achieve a large color gamut and to faithfully reproduce the natural colors, the emission peak of phosphors should match well with the RGB color filters of LCDs. Phosphors with narrow emission bands would loss less their luminescence after passing through color filters, and also promise high color purity. Therefore, narrow-band phosphors with appropriate emission maximum are required for high efficiency and wide color gamut backlights. 13,15 Quantum dots (QDs) materials have shown great potentials for next-generation displays due to their narrow emission band. [7][8][9][10][11][12] In comparison to traditional CCFL having a color gamut of ∼75% of the National Television Standard Committee (NTSC) standard, the Cdcontaining QDs-integrated white LED backlights promise a large color gamut of > 100% NTSC, but the application has been limited due to the usage restrictions of hazardous Cd compounds. Compared to Cdcontaining rivals, the non-toxic InP/ZnS QDs only yield a color gamut of 87% NTSC due to the quite broader emission band.11 Moreover, it is difficult to maintain the initial optical properties of the QDs during device fabricatio...

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Recent progress in luminescence tuning of Ce³⁺and Eu²⁺-activated phosphors for pc-WLEDs

Cited by 812 publications

References 169 publications

Inorganic Phosphor Materials for Lighting

Inorganic Phosphor Materials for Lighting

Pt/Y2O3:Eu3+ composite nanotubes: Enhanced photoluminescence and application in dye-sensitized solar cells

Critical Review—Narrow-Band Nitride Phosphors for Wide Color-Gamut White LED Backlighting

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Recent progress in luminescence tuning of Ce3+and Eu2+-activated phosphors for pc-WLEDs

Cited by 812 publications

References 169 publications

Inorganic Phosphor Materials for Lighting

Inorganic Phosphor Materials for Lighting

Pt/Y2O3:Eu3+ composite nanotubes: Enhanced photoluminescence and application in dye-sensitized solar cells

Critical Review—Narrow-Band Nitride Phosphors for Wide Color-Gamut White LED Backlighting

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Recent progress in luminescence tuning of Ce³⁺and Eu²⁺-activated phosphors for pc-WLEDs