Ternary solid solution phosphors Ca1--Li Al1--Si1++N3-O :Ce3+ with enhanced thermal stability for high-power laser lighting

You, Shihai; Li, Shuxing; Wang, Le; Takeda, Takashi; Hirosaki, Naoto; Xie, Rong‐Jun

doi:10.1016/j.cej.2020.126575

Cited by 48 publications

(28 citation statements)

References 66 publications

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“…Here, the distribution of light atom Li cannot be seen in the SEM-EDS results of LSPO:0.008Mn 2+ ,0.02Yb 3+ sample because the corresponding X-ray energy is too low. wavelength is 616 nm, the PLE spectrum contains several main excitation bands at about 265, 320, 358, 414, 463, and 510 nm, which are attributed to the Mn 2+ −O 2− charge transfer band, 6 A 1 ( 6 S)→ 4 T 1 (P), 6 A 1 ( 6 S)→ 4 E( 4 D), 6 A 1 ( 6 S)→[ 4 A 1 ( 4 G), 4 E( 4 G)], 6 A 1 ( 6 S)→ 4 T 2 (G), and 6 A 1 ( 6 S)→ 4 T 1 (G) transitions of the Mn 2+ ions, respectively. 14,53,54 When excited by 414 nm, LSPO:0.008Mn 2+ emits red light at about 616 nm, originating from the 4 T 1 (G)→ 6 A 1 ( 6 S) transition of the Mn 2+ ions.…”

Section: Measurements and Characterizationmentioning

confidence: 99%

“…55 Pleasantly, when the prepared sample is excited by 300 nm light, an unexpected broad and smooth NIR emission band peaking at 800 nm (fwhm = 112 nm) is detected. The excitation spectrum corresponding to the 800 nm emission peak consists of a dominant band at about 300 nm and two weak excitation bands at about 413 and 463 nm, respectively, which stem from the Mn 2+ −O 2− charge transfer band, 6 A 1 ( 6 S)→ 4 T 2 (G) and 6 A 1 ( 6 S)→ 4 T 1 (G) transitions of the Mn 2+ ions, respectively. 56 The above spectral analysis shows that LSPO:0.008Mn 2+ is not only a potential redemitting phosphor for WLED but also a NIR phosphor for NIR-LED.…”

Section: Measurements and Characterizationmentioning

confidence: 99%

“…[1][2][3][4] Recently, pc-WLEDs have attracted extensive attention as a new generation of solid-state lighting equipment, which is displacing the traditional incandescent, mercury, and fluorescent lamps due to their advantages of low energy consumption, high efficiency, environment friendly, and long service time. [5][6][7][8][9][10][11] Currently, the main commercial WLEDs are to combine a 460 nm emitting LED chip and a yellow-emitting YAG:Ce 3+ phosphor. [12][13][14][15][16] However, this combination suffers from the disadvantages of high correlated color temperature (CCT) and low color rendering index (Ra) because of insufficient red light components.…”

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confidence: 99%

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Efficient red and broadband near‐infrared luminescence in Mn²⁺/Yb³⁺‐doped phosphate phosphor

Dong

Zhang

et al. 2021

J. Am. Ceram. Soc.

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Nowadays, human beings are facing the challenge of deteriorating natural environment and depleting resources with the rapid growth of population and the advancement of modernization process. The exploration of energy-saving and environment-friendly technologies and the development of advanced functional materials are expected to alleviate this crisis. [1][2][3][4] Recently, pc-WLEDs have attracted extensive attention as a new generation of solid-state lighting equipment, which is displacing the traditional incandescent, mercury, and fluorescent lamps due to their advantages of low energy consumption, high efficiency, environment friendly, and long service time. [5][6][7][8][9][10][11] Currently, the main commercial WLEDs are to combine a 460 nm emitting LED chip and a yellow-emitting YAG:Ce 3+ phosphor. [12][13][14][15][16] However, this combination suffers from the disadvantages of high correlated color temperature (CCT) and low color rendering index (Ra) because of insufficient red light components. [17][18][19][20] Another alternative means for obtaining white light is by combining near ultraviolet LED (n-UV-LED) chips with tricolor phosphors. [21][22][23][24] Either way, the red light component is essential for obtaining high-quality white light. Therefore, many researchers are committed to developing red phosphors with excellent properties. There are some reports on red emitters, such as Sr [LiAl 3 N 4

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Section: Measurements and Characterizationmentioning

confidence: 99%

Section: Measurements and Characterizationmentioning

confidence: 99%

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confidence: 99%

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Efficient red and broadband near‐infrared luminescence in Mn²⁺/Yb³⁺‐doped phosphate phosphor

Dong

Zhang

et al. 2021

J. Am. Ceram. Soc.

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“…CPs are currently proved to be an excellent type attributed to advantages of superior thermal conductivity (4-25 W m −1 K −1 ) and stronger thermal shock resistance. [24,25] Great attentions focus on the yellow Y 3 Al 5 O 12 :Ce resulted from oxygen vacancies. [42] After annealing in air, color centers disappear and CPs change into bright yellow.…”

Section: Introductionmentioning

confidence: 99%

“…[19][20][21][22][23] Recently, yellow/green/red CPs were discovered to rich spectral components and modify the color quality for white LD lighting. [24][25][26][27][28] Lu 3 Al 5 O 12 :Ce (LuAG:Ce) is a well-known green color converter due to its high thermal stability and high efficiency. [29][30][31] LuAG:Ce CPs are regarded as the best type that is robust irradiated by high-power LD light (15-25 W, up to 49 W mm −2 ).…”

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High Efficiency Green‐Emitting LuAG:Ce Ceramic Phosphors for Laser Diode Lighting

Liu

et al. 2021

Advanced Optical Materials

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CP because it can be achieved white light directly combined with blue LDs. [19][20][21][22][23] Recently, yellow/green/red CPs were discovered to rich spectral components and modify the color quality for white LD lighting. [24][25][26][27][28] Lu 3 Al 5 O 12 :Ce (LuAG:Ce) is a well-known green color converter due to its high thermal stability and high efficiency. [29][30][31] LuAG:Ce CPs are regarded as the best type that is robust irradiated by high-power LD light (15-25 W, up to 49 W mm −2 ). [32][33][34][35][36] The luminous efficacy (LE) of LuAG:Ce CPs in LD lighting has been greatly enhanced from about 54 to 205 lm W −1 by designing geometric structures and introducing scattering centers. [32][33][34][35][36][37] However, LuAG CPs are usually sintered higher than 1700 °C, SiO 2 or TEOS is commonly added as sintering aid. [32][33][34] SiO 2 begins to react with the garnets at about 1400 °C, [38] and defects are inevitable due to the size and charge mismatches between Si 4+ and Lu 3+ /Al 3+ . [39] The defects decline the thermal stability that is directly related with the performance of LuAG:Ce in LD lighting. [19] Thus, how to depress the defect and maintain the high thermal stability is the hardest challenge in fabricating LuAG CPs and achieving high LE value.As we know, heavy atom can depress lattice relaxation and improve thermal stability. [40,41] Considering valence state, in this work, we design the Ba 2+ -Si 4+ pair to substitute the Lu 3+ -Al 3+ pair to keep charge balance. SiO 2 powder are used as sintering aid and BaCO 3 provides the Ba 2+ to control defects and adjust thermal stability. Combining annealing process in air to eliminate oxygen vacancies, LuAG:Ce CPs manifest high LE of 213.7-216.9 lm W −1 in LD lighting, which is the best performance up to date. These results demonstrate that suitable strategies further improve LuAG:Ce CPs properties, thus in turn making great contributions to high-brightness and efficient white LD lighting. The tunable thermal stability by Ba 2+ -Si 4+ pairs and relationships with performance of LuAG:Ce CPs in LD lighting are detailed in present report. Results and DiscussionNominal compositions of Lu 2.995−x Ba x Al 5−x Si x O 12 :0.005Ce (LuAG:0.5%Ce+xBS, x = 0, 0.005, 0.01, 0.015, and 0.02) CPs sintered in vacuum are dark yellow (unannealed samples in Figure 1a), especial for x = 0, due to a lot of color centers Lu 3 Al 5 O 12 :Ce 3+ (LuAG:Ce 3+ ) ceramic phosphors (CPs) are regarded as the most promising green color converter and play a key role in high quality white light in the next-generation laser diode (LD) lighting. High efficient LuAG:Ce 3+ CPs are still urgent for high luminous efficacy (LE) LD lighting devices. By designing the Ba 2+ -Si 4+ pair to keep charge balance and annealing in air to remove oxygen vacancy defects, the luminescent properties of LuAG:Ce CPs are greatly enhanced. The LE is promoted to 216.9 lm W −1 , which is the best performance of LuAG:Ce in LD lighting so far. Strategies for optimizing LuAG:Ce 3+ CPs are detailed. It is believed ...

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How to Obtain Anti‐Thermal‐Quenching Inorganic Luminescent Materials for Light‐Emitting Diode Applications

Dang

Wang

Lian

et al. 2022

Advanced Optical Materials

113

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phosphor-converted light-emitting diodes (pc-LEDs) have been widely used in solidstate lighting, backlighting, near-infrared (NIR) light sources, etc. [1] As an important component in pc-LED devices, phosphors have been developed rapidly because of their attractive and tunable optical properties. Photoluminescence (PL) thermal stability of phosphor materials is evaluated by the thermal quenching (TQ) behavior, which is related to the electronic/crystal structure, structural rigidity, and chemical composition of phosphors. [2] To achieve high brightness, high-power LED chips that operate at high currents are usually required. In this case, a large amount of heat will lead to a high temperature on the surface of chips. This heat activates more

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Ternary solid solution phosphors Ca1--Li Al1--Si1++N3-O :Ce3+ with enhanced thermal stability for high-power laser lighting

Cited by 48 publications

References 66 publications

Efficient red and broadband near‐infrared luminescence in Mn²⁺/Yb³⁺‐doped phosphate phosphor

Efficient red and broadband near‐infrared luminescence in Mn²⁺/Yb³⁺‐doped phosphate phosphor

High Efficiency Green‐Emitting LuAG:Ce Ceramic Phosphors for Laser Diode Lighting

How to Obtain Anti‐Thermal‐Quenching Inorganic Luminescent Materials for Light‐Emitting Diode Applications

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Ternary solid solution phosphors Ca1--Li Al1--Si1++N3-O :Ce3+ with enhanced thermal stability for high-power laser lighting

Cited by 48 publications

References 66 publications

Efficient red and broadband near‐infrared luminescence in Mn2+/Yb3+‐doped phosphate phosphor

Efficient red and broadband near‐infrared luminescence in Mn2+/Yb3+‐doped phosphate phosphor

High Efficiency Green‐Emitting LuAG:Ce Ceramic Phosphors for Laser Diode Lighting

How to Obtain Anti‐Thermal‐Quenching Inorganic Luminescent Materials for Light‐Emitting Diode Applications

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Efficient red and broadband near‐infrared luminescence in Mn²⁺/Yb³⁺‐doped phosphate phosphor

Efficient red and broadband near‐infrared luminescence in Mn²⁺/Yb³⁺‐doped phosphate phosphor