GaN phosphors converted white light‐emitting diodes for high luminous efficacy and improved thermal stability

Kumar, Mirgender; Kumar, Suraj; Kumar, Anuj; Seong, Kwang-Su; Park, Si-Hyun

doi:10.1049/iet-opt.2019.0084

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…Wang reports on a green phosphor, SrLuSi 4 N 7 :Ce 3+ , Tb 3+ , capable of tuning its color under ultraviolet excitation for use in white LEDs [17]. Binary nitrides, known for their straightforward structure and wide bandgap, have gained attention as matrices for nitride phosphors, including rare earth ion-doped GaN, AlN, and Si 3 N 4 phosphors [18][19][20][21][22][23][24]. Hexagonal boron nitride (h-BN) possesses a wide bandgap of approximately 5.2 eV and outstanding thermochemical stability, and has been identi ed as an ideal host material for inorganic phosphors [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Effect of Tb3+ and Ce3+ co-doping on the structural stability and photoluminescence properties of hexagonal boron nitride phosphors

Nie,

Jia,

Guo

et al. 2024

Preprint

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In the paper, we have successfully prepared hexagonal boron nitride (h-BN) phosphors with melamine as the nitrogen source. The X-ray powder diffraction patterns confirm that the sample possesses a hexagonal crystal structure within the Pm2 space group. It is interesting that the co-doping combination of Tb3+ and Ce3+ can markedly enhance the threshold concentration of doped activators within the limited solid solution of h-BN phosphors. Under 302 nm excitation, the h-BN:Ce3+ phosphors exhibit broadband blue light emission at 406 nm. In h-BN:Tb3+, Ce3+ phosphors, the co-doping of Ce3+ not only ensures high phase purity but also results in strong green light emission. The energy transfer efficiency from Ce3+ to Tb3+ is about 55%. The fluorescence lifetime increases with the increase of Ce3+ and Tb3+ concentration, and the fluorescence lifetime of h-BN:0.025Tb3+, 0.05Ce3+ phosphor reached 2.087 ms. Additionally, the h-BN:0.025Tb3+, 0.05Ce3+ phosphor exhibits excellent thermal performance with an activation energy value of 0.2825 eV. Moreover, the photoluminescence quantum yield of the sample exceeds 52%. Therefore, the h-BN:Tb3+, Ce3+ samples can be used as green phosphors for solid state lighting and fluorescent labeling.

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Section: Introductionmentioning

confidence: 99%

Effect of Tb3+ and Ce3+ co-doping on the structural stability and photoluminescence properties of hexagonal boron nitride phosphors

Nie,

Jia,

Guo

et al. 2024

Preprint

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“…[4] The performance of LEDs depends on different factors, including luminous efficiency, color rendering index (CRI), and correlated color temperature (CCT). [5] Luminous efficiency can be improved by various techniques such as nanostructured blue-chip, sapphire substrate with coneshaped nanopattern, [6] GaN nanoparticles as phosphors and GQDs as charge-transfer medium, [7] and air voids between GaN nanopillars and the GaN layer. [8,9] Dual structure phosphor layer and textured phosphor structures were also found to improve luminous efficiency.…”

Section: Introductionmentioning

confidence: 99%

Improving the Light Quality of White Light‐Emitting Diodes Using Cellulose Nanocrystal‐Filled Phosphors

Chowdhury

Wang

2021

Advanced Photonics Research

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Light‐emitting diode (LED) lighting delivers better performance and reliability, and substantially lowers the total cost of ownership compared with conventional lighting. The most common white LED is generally produced using a blue LED chip and phosphor combination to generate white light. This type of phosphor‐converted white LED can be a great alternative to the more expensive 3 chip RGB (red, green, blue) LED. Herein, cellulose nanocrystals, a wood‐derived biopolymer, are used with phosphor to improve the uniformity of correlated color temperature (CCT) and luminous flux from the white LED. These nanocrystals can scatter light strongly and for an optimized concentration of nanocrystals, it is found to increase the luminous flux of the white LED by over 30% compared with the reference sample without any nanocrystal. The CCT uniformity is also improved from 173.45 K for the reference sample to 59 K for the optimized sample. The chromaticity coordinates are also studied and found to be shifting toward lower correlated color temperatures with increasing cellulose concentrations. Combining these results with low cost, wide availability, and environmental impact, cellulose nanocrystals can play an important role in the future generation of white LEDs.

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Effect of Tb3+ and Ce3+ Co-doping on the Structure and Photoluminescence Properties of Hexagonal Boron Nitride Phosphors

Nie,

Jia,

Guo

et al. 2024

J Fluoresc

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GaN phosphors converted white light‐emitting diodes for high luminous efficacy and improved thermal stability

Cited by 4 publications

References 13 publications

Effect of Tb3+ and Ce3+ co-doping on the structural stability and photoluminescence properties of hexagonal boron nitride phosphors

Effect of Tb3+ and Ce3+ co-doping on the structural stability and photoluminescence properties of hexagonal boron nitride phosphors

Improving the Light Quality of White Light‐Emitting Diodes Using Cellulose Nanocrystal‐Filled Phosphors

Effect of Tb3+ and Ce3+ Co-doping on the Structure and Photoluminescence Properties of Hexagonal Boron Nitride Phosphors

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