Combinatorial chemistry of oxynitride phosphors and discovery of a novel phosphor for use in light emitting diodes, Ca1.5Ba0.5Si5N6O3:Eu2+

Park, Woon Bae; Singh, Satendra Pal; Yoon, Chang-Hwan; Sohn, Kee‐Sun

doi:10.1039/c2tc00731b

Cited by 76 publications

(72 citation statements)

References 28 publications

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“…Moreover, by the variation of local crystal structure, one can also expect to improve the thermal stability of phosphors due to the optimization of lattice rigidity. Some methods for exploration and discovery of novel pc-WLED phosphors, especially, (oxy)nitride phosphors, including the single crystal growth method (by Schinick's group), 36,170-173 the single-particlediagnosis approach (by Xie and Hirosaki's group), 174,175 the heuristics optimization based solid state combinatorial chemistry method (by Sohn's group) 176,177 and so on should be concerned and encouraged, which might readily be scaled up for industrial WLED applications. Therefore, there is no a general law to be suitable for all phosphor systems at current, and more concerns should be focused on exploring the structured-related luminescence mechanisms.…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2015

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Nowadays, phosphor converted white light-emitting diodes (pc-WLEDs) have been widely used in solid-state lighting and display areas due to their superior lifetime, efficiency, and reliability as well as significant reduction in power consumption. Phosphors are indispensable components of pc-WLED devices, and their luminescence properties determine the quality of WLED lighting and displays. In order to further achieve high luminous efficacy, chromatic stability, and color-rending properties in pc-WLEDs, much effort has been focused on improving current pc-WLED phosphors and developing novel pc-WLED phosphors recently. This review article concerns commonly used rare earth ion (Eu(2+) and Ce(3+)) activated inorganic phosphors, highlighting the important effect of spectral tuning via local structural variations on improving the luminescence performance of phosphors. The main spectral tuning strategies are discussed in detail and summarized, including (1) doping level control; (2) cationic substitution; (3) anionic substitution; (4) cationic-anionic substitution; (5) the crystal-site engineering approach; (6) mixing of nanophases.

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Section: Discussionmentioning

confidence: 99%

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

et al. 2015

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“…S olid-state white light-emitting diodes (LEDs) are nextgeneration lighting devices for replacing the traditional incandescent and fluorescent lamps due to their superior properties such as energy-saving, robust, long-lifetime and environment-friendly features [1][2][3][4][5][6][7][8][9][10][11][12][13] . Nowadays, a blue diode chip combined with Y 3 Al 5 O 12 :Ce 3 þ (YAG:Ce 3 þ ) yellow phosphor is still the most mature method for fabricating commercial white LEDs.…”

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confidence: 99%

Highly efficient non-rare-earth red emitting phosphor for warm white light-emitting diodes

et al. 2014

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Mn 4 þ -activated fluoride compounds, as an alternative to commercial (oxy)nitride phosphors, are emerging as a new class of non-rare-earth red phosphors for high-efficacy warm white LEDs. Currently, it remains a challenge to synthesize these phosphors with high photoluminescence quantum yields through a convenient chemical route. Herein we propose a general but convenient strategy based on efficient cation exchange reaction, which had been originally regarded only effective in synthesizing nano-sized materials before, for the synthesis of Mn 4 þ -activated fluoride microcrystals such as K 2 TiF 6 , K 2 SiF 6 , NaGdF 4 and NaYF 4 . Particularly we achieve a photoluminescence quantum yield as high as 98% for K 2 TiF 6 :Mn 4 þ . By employing it as red phosphor, we fabricate a high-performance white LED with low correlated colour temperature (3,556 K), high-colour-rendering index (R a ¼ 81) and luminous efficacy of 116 lm W À 1 . These findings show great promise of K 2 TiF 6 :Mn 4 þ as a commercial red phosphor in warm white LEDs, and open up new avenues for the exploration of novel non-rare-earth red emitting phosphors.

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“…The phase purity of samples was analyzed by X-ray diffraction (XRD) 20 using a D2 PHASER X-ray Diffractometer with Ni-filtered Cu Kα radiation. Structure refinement was performed using the Rietveld method, 26 using the program GSAS.…”

Section: Methodsmentioning

confidence: 99%

“…9(a) we can find that as the time delays, the shape of the spectra has little change but for a little redshift. The little redshift manifests that there is still a little energy transfer exists because the content of 1% Ce activator is 20 not dilute enough to guarantee little chance of interaction with the quenching site and no chance for interactivator energy transfer. On the other hand, as the time delays, the TRES of Ca 15 Si 20 O 10 N 30 :0.02Ce 3+ exhibits an obvious change in the shape and a large redshift in the peak position, which is due to the fact 25 that as the Ce 3+ content increases, the acceptor components in the lower energy side (longer wavelength side) get stronger while the donor components in the higher energy side are weakened.…”

Section: Methodsmentioning

confidence: 99%

“…There has been considerable interest in white light-emitting diodes (LEDs), which have become widely available as an environmentally friendly lighting system known as solid-state lighting (SSL), owing to their long operation lifetime, low energy 20 consumption, high material stability, and so on. [1][2][3] Generally, two different configurations are possible for white LEDs, based on either a blue LED or a near-ultraviolet (UV) LED.…”

Section: Introductionmentioning

confidence: 99%

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Blue to green emission and energy transfer between Ce³⁺ ions in Ca₁₅Si₂₀O₁₀N₃₀

Ding

et al. 2015

J. Mater. Chem. C

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A near-ultraviolet (near-UV) excited phosphor, Ca 15 Si 20 O 10 N 30 :Ce 3+ , was synthesized by a solid state reaction, and the crystal structure and luminescence properties were investigated in detail. Ca 15 Si 20 O 10 N 30 crystallizes in a cubic unit cell with space group Pa3 _ and the lattice parameters were determined to be a = b = c = 15.4195 (3) Å. The maximum emission wavelength can be tuned from about 470 nm to 520 nm as the content of Ce 3+ increases due to the energy transfer between various Ce 3+ activators located at 10 different coordination environments, which was verified by the time-resolved emission spectra (TRES) and the variation in decay rate with respect to the detection wavelength. Upon excitation at 365 nm, Ca 15 Si 20 O 10 N 30 :Ce 3+ exhibited a relatively low thermal quenching, and the T 50 is measured to be 233 °C. The above results indicate that Ca 15 Si 20 O 10 N 30 :Ce 3+ is a promising candidate for application in white light emitting diodes (white LEDs).

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Combinatorial chemistry of oxynitride phosphors and discovery of a novel phosphor for use in light emitting diodes, Ca1.5Ba0.5Si5N6O3:Eu2+

Cited by 76 publications

References 28 publications

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

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

Highly efficient non-rare-earth red emitting phosphor for warm white light-emitting diodes

Blue to green emission and energy transfer between Ce³⁺ ions in Ca₁₅Si₂₀O₁₀N₃₀

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Combinatorial chemistry of oxynitride phosphors and discovery of a novel phosphor for use in light emitting diodes, Ca1.5Ba0.5Si5N6O3:Eu2+

Cited by 76 publications

References 28 publications

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

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

Highly efficient non-rare-earth red emitting phosphor for warm white light-emitting diodes

Blue to green emission and energy transfer between Ce3+ ions in Ca15Si20O10N30

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

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

Blue to green emission and energy transfer between Ce³⁺ ions in Ca₁₅Si₂₀O₁₀N₃₀