A promising blue-emitting phosphor CaYGaO4:Bi3+ for near-ultraviolet (NUV) pumped white LED application and the emission improvement by Li+ ions

Fu, Yubin; Xiong, Puxian; Liu, Xiaoqi; Wang, Xiu; Wu, Sheng; Liu, Quan; Peng, Mingying; Chen, Yan

doi:10.1039/d0tc03941a

Cited by 62 publications

(35 citation statements)

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“…The non-equivalency cation substitution is a prevalent strategy to enhance the optical efficiency of luminescent materials. [30,56,57] Here, codoping with Li + is proposed to improve the PersL performance of MGO:Fe 3+ in this study. The shape of PL and PersL spectra of MGO:Fe 3+ samples with and without Li + is identical, suggesting that the incorporation of Li + may act as new trap center instead of emission center.…”

Section: Resultsmentioning

confidence: 99%

Defect Enrichment in Near Inverse Spinel Configuration to Enhance the Persistent Luminescence of Fe³⁺

Zhou

Zhang

et al. 2021

Advanced Optical Materials

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Up to now, PersL materials emitting visible light have been extensively studied and applied in emergency signage, optical data storage and anti-counterfeiting, energy-saving catalysis, and many other aspects. [10][11][12][13][14][15][16][17][18][19] Recently, near-IR (NIR) PersL materials have received particular interest due to their great application prospects in various biomedical applications, such as autofluorescence-free bioimaging, longterm biomolecule tracking. [20][21][22][23][24][25][26][27] However, in stark contrast to the evolving progress in the research of the PersL materials in visible region, the study concerning the design and development of NIR PersL materials is still lacking. [28,29] Hence, it is significantly important to develop and make up the number of NIR PersL materials.The luminescent materials are composed of matrixes and activators, the activators exist as emission centers while the matrixes provide an appropriate crystal environment for activators. [30] At present, most reported NIR PersL materials are based on Cr 3+ emitters. [28] Nevertheless, the toxicity of chromium might lead to biosafety and biodistribution issues of these Cr 3+ -activated materials in organisms, which would severely hindered further practical bioapplications. [31][32][33] As an essential element of the human body, the promising and so far rarely investigated ferric ions can be a considerable candidate for activator ions to address the toxicity issue of Cr 3+ . [34] Unfortunately, the number of studies on the rational design of Fe 3+doped NIR PersL remains very quiet. [35,36] Hitherto, the majority of the research concerning Fe 3+ -activated luminescent materials is devoted to their photoluminescence (PL) properties and the related luminescence thermometer application. [37,38] This may be because Fe 3+ is usually regarded as a luminescent quencher, and it is hard to control the crystal environments of the matrixes for achieving PersL of Fe 3+ . Therefore, it is vital importance to explore a special crystal structure and regulate the defect properties for the development of Fe 3+ -activated NIR PersL materials.Spinel configuration can be one of the best host material candidates when designing PersL materials owing to the easy formation of vacancies and anti-site defects. [39,40] However, the PersL from Fe 3+ doped in spinel-type compounds has never been reported before. [41] Herein, we propose a new strategy of defect enrichment for the activation of PersL, and in contrast to the normal spinel configuration, we demonstrate that the crystal structure of near inverse spinel ensures more numerous Spinel configuration is a kind of broadly considered host candidate when designing persistent luminescence (PersL) materials due to the easy generation of vacancies and anti-site defects. Here, a new strategy of defect enrichment for the activation of PersL is proposed, and in contrast to the spinel configuration, it is demonstrated that the crystal structure of near inverse spinel ensures more numerous defects to activat...

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Section: Resultsmentioning

confidence: 99%

Defect Enrichment in Near Inverse Spinel Configuration to Enhance the Persistent Luminescence of Fe³⁺

Zhou

Zhang

et al. 2021

Advanced Optical Materials

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“…Li + /Na + /K + cation codoping is a common strategy for enhancing luminescent materials, and this strategy has been successfully applied to phosphor systems such as CaYGaO 4 :Bi 3+ , CaSr 0.97 Al 2 SiO 7 :0.03Ce 3+ , and Na 2 SiF 6 :Mn 4+ . [ 1,39,42 ] Therefore, we used Li 2 CO 3 /Na 2 CO 3 /K 2 CO 3 as a basic cationic raw material to enhance the emission intensity of BZWO:0.006Bi 3+ phosphors. Figure a–c depicts the emission spectra of BZWO:0.006Bi 3+ doped with alkaline cations (Li 2 CO 3 /Na 2 CO 3 /K 2 CO 3 ).…”

Section: Resultsmentioning

confidence: 99%

“…The phosphor‐converted white light‐emitting diode (pc‐WLEDs) has attracted a lot of attention due to its energy efficiency, longer operating life, high luminous efficacy, and environmental friendliness. [ 1 ] Currently, commercial white LEDs on the market are composed of blue LED chips and yellow phosphors Y 3 Al 5 O 12 :Ce 3+ , [ 2 ] which are produced by mixing blue and yellow light. However, due to the insufficient red‐light component in the emission, the color rendering index is low (Ra < 80), and the correlated color temperature is high (CCT > 4500 K), which limits the application in high‐quality lighting.…”

Section: Introductionmentioning

confidence: 99%

Single Bi³⁺ Ultrabroadband White Luminescence in Double Perovskite via Crystal Lattice Engineering toward Light‐Emitting Diode Applications

Liu

Xiong

et al. 2022

Advanced Optical Materials

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Single‐phase white luminescence phosphors are emerging for potential phosphor‐converted white light‐emitting diodes (pc‐WLEDs) and alternatives to trichromatic phosphor blends. In this work, Ba2ZnWO6:Bi3+ phosphors are prepared by a high‐temperature solid‐state reaction method and the luminescent properties are investigated. The broadband excitation from 250 to 400 nm is perfectly matched with the emission of nearly ultraviolet (n‐UV) InGaN chip, which ultrabroadband emission band (full width at half maximum = 217 nm) can cover a wider luminescence region. Li+/Na+/K+ codoping is more desirable for the ultrabroadband emission of Ba2ZnWO6:0.006Bi3+ due to the charge compensation and rationally designed lattice distortion while improving the thermal stability of the phosphor. Furthermore, tunable emissions can be achieved either by changing the content of doped ions or the excitation wavelength due to the different occupation of Ba2+ and Zn2+ sites by Bi3+ ions. Finally, single‐phase warm WLED ((x, y) = (0.4170, 0.4035)) devices with a correlated color temperature of 3329 K and color rendering index of Ra = 75.3 are successfully prepared using Ba2ZnWO6:0.006Bi3+, 0.03Na+ phosphor, and 365 nm InGaN chips. These results indicate that Ba2ZnWO6:Bi3+ has excellent potential as phosphor for n‐UV pc‐WLEDs and provides new ideas for the application of ultrabroadband emitting phosphors in WLEDs.

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“…The phosphor‐convert white light‐emitting diodes (pc‐WLEDs) based on rare‐earth (RE)‐activated materials (eg, Y 3 Al 5 O 12 :Ce 3+ , 1 BaMgAl 10 O 17 :Eu 2+ , 2 (Sr,Ba) 3 SiO 5 :Eu 2+ , CaAlSiN 3 :Eu 2+ , 3 Y 2 O 3 :Eu 3+ , 4 and (Ba,Sr) 2 SiO 4 :Eu 2+ commercial phosphors) have been widely used in lighting displays and decoration fields as the fourth‐generation lighting sources in our daily life. The pc‐WLEDs have outstanding characteristics of energy saving, 5 fast response, 6 high luminous efficiency, 7 stable output, 8 long service time, 9 etc with respect to conventional incandescent lamps.…”

Section: Introductionmentioning

confidence: 99%

Effects of activated Sr ²⁺ ion content on strong blue‐emitting Ca ₂ Sb ₂ O ₇ materials for high‐quality WLED devices

Hua

Dang

Wang

et al. 2022

Intl J of Energy Research

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Summary In this report, the luminescent performances of the self‐host blue‐emitting Ca2Sb2O7 materials were investigated in terms of the sintering temperature and the dopant Sr2+ ion content. The emission intensity was enhanced with an increase of the sintering temperature as well as the lattice parameters. After doping the Sr2+ ions (>1.2 mol%), the emission spectra of Ca2Sb2O7 materials would be redshifted. The blue‐emitting color (Ca2Sb2O7) turned into greenish‐blue (Sr2+@1.6 mol%) and green (Sr2+@2 mol%) colors in sequence. In light of these interesting findings, the crystal structure, elemental composition, morphology, thermal stability, luminescent dynamics, luminescent efficiency, etc were investigated and compared. Finally, the mini‐white lighting‐emitting diodes (WLEDs) based on the blue‐emitting Ca2Sb2O7, greenish‐blue‐emitting Ca0.4Sr1.6Sb2O7, and green‐emitting Sr2Sb2O7 phosphors were fabricated by mixing commercial phosphors (CP). Especially, the Ca2Sb2O7‐CP‐WLED and Sr2Sb2O7‐CP‐WLED devices exhibited a warm white light with good correlated color temperature (<3200 K) and excellent color‐rendering index (>88). All the above results suggested that the self‐host emitting materials of Sr2+ activated Ca2Sb2O7 with color‐tunable properties could be very promising for solid‐state lighting applications.

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A promising blue-emitting phosphor CaYGaO₄:Bi³⁺ for near-ultraviolet (NUV) pumped white LED application and the emission improvement by Li⁺ ions

Abstract: In this paper, a blue-emitting phosphor CaYGaO4: Bi3+ is reported, which has a broad emission band peaked at 435 nm covering 375 nm to 575 nm spectral region. The CIE...

Cited by 62 publications

References 59 publications

Defect Enrichment in Near Inverse Spinel Configuration to Enhance the Persistent Luminescence of Fe³⁺

Defect Enrichment in Near Inverse Spinel Configuration to Enhance the Persistent Luminescence of Fe³⁺

Single Bi³⁺ Ultrabroadband White Luminescence in Double Perovskite via Crystal Lattice Engineering toward Light‐Emitting Diode Applications

Effects of activated Sr ²⁺ ion content on strong blue‐emitting Ca ₂ Sb ₂ O ₇ materials for high‐quality WLED devices

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A promising blue-emitting phosphor CaYGaO4:Bi3+ for near-ultraviolet (NUV) pumped white LED application and the emission improvement by Li+ ions

Abstract: In this paper, a blue-emitting phosphor CaYGaO4: Bi3+ is reported, which has a broad emission band peaked at 435 nm covering 375 nm to 575 nm spectral region. The CIE...

Cited by 62 publications

References 59 publications

Defect Enrichment in Near Inverse Spinel Configuration to Enhance the Persistent Luminescence of Fe3+

Defect Enrichment in Near Inverse Spinel Configuration to Enhance the Persistent Luminescence of Fe3+

Single Bi3+ Ultrabroadband White Luminescence in Double Perovskite via Crystal Lattice Engineering toward Light‐Emitting Diode Applications

Effects of activated Sr 2+ ion content on strong blue‐emitting Ca 2 Sb 2 O 7 materials for high‐quality WLED devices

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A promising blue-emitting phosphor CaYGaO₄:Bi³⁺ for near-ultraviolet (NUV) pumped white LED application and the emission improvement by Li⁺ ions

Defect Enrichment in Near Inverse Spinel Configuration to Enhance the Persistent Luminescence of Fe³⁺

Defect Enrichment in Near Inverse Spinel Configuration to Enhance the Persistent Luminescence of Fe³⁺

Single Bi³⁺ Ultrabroadband White Luminescence in Double Perovskite via Crystal Lattice Engineering toward Light‐Emitting Diode Applications

Effects of activated Sr ²⁺ ion content on strong blue‐emitting Ca ₂ Sb ₂ O ₇ materials for high‐quality WLED devices