CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xin Zhang,Ruirui Cui,Min Zhang,Chaoyong Deng
The development of white light emitting diodes (WLEDs) prepared with tricolor phosphors is limited by issues such as reabsorption, difficulty in controlling sample proportions, low thermal stability, etc . This study synthesized a series of single-host Ca 2 GdNbO 6 : x Dy 3+ (CGNO: x Dy 3+ ) phosphors using High-temperature Solid-state Reaction. Then the structure characteristics, luminescence, thermal stability, and morphology were analyzed in detail. The results showed that all the samples, emitted white light superposed by the blue at 483 nm and the yellow light at 575 nm under near-ultraviolet excitation, exhibit good quantum yield, excellent optical properties, and good moisture resistance. Besides, the CIE chromaticity coordinates (CIE) and luminous pictures of CGNO: x Dy 3+ phosphors both at 352 nm and 389 nm were investigated. Then, the properties of LED devices obtained by coating the aforementioned phosphors on 365 nm and 395 nm chips were characterized. The research confirmed that CGNO: x Dy 3+ are potential single-host white light phosphors in the field of lighting.
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DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 24
·9501-9510
·
IF 4.569
Jianhong Ding,Meng Kuang,Shuifu Liu,Ziheng Zhang,Kangrong Huang,Jiansheng Huo,Haiyong Ni,Qiuhong Zhang,Junhao Li
Developing novel luminescent materials with ideal properties is an endless project, urged by growing requirements of advances in energy saving, healthy lighting and environmental friendliness. Herein, a series of ScCaOBO3:Ce3+,Mn2+ phosphors with excellent luminescence properties were synthesized by the high temperature solid state method. X-ray diffraction was applied to analyse the phase composition of the obtained phosphors. The morphology and dopant distribution were observed by scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS), respectively. The Rietveld refinements and luminescence spectra indicate that Ce3+ preferentially occupies the Sc3+ site and produces a blue emission band at around 460 nm, which originates from the characteristic 5d–4f transitions, while Mn2+ preferentially occupies the Ca2+ site and emits red light due to its characteristic 4T1(4G)–6A1(6S) transitions. Upon excitation at 354 nm, both Ce3+ and Mn2+ emissions can be obtained and further investigations evidenced that the broad and intense light emission of Mn2+ located in the red spectral region is the result of energy transfer from Ce3+ to Mn2+. Theoretical calculations reveal that the energy transfer process from Ce3+ to Mn2+ is of the resonance type and is governed by electric dipole–dipole interactions. Since the ScCaOBO3:Ce3+,Mn2+ phosphors are capable of producing broadband emissions that widely cover the blue and red spectral regions, the introduction of a green light-emitting phosphor CMA:Tb3+ can conveniently generate high quality white light. Therefore, a white light-emitting diode device with extremely high color rendering indices, Ra = 93.7 and R9 = 91.9, was successfully obtained.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Sen Ming,Ying Chen,Chang Liu,Hui Zeng,Linhua Xu,Jing Su
Rare earth ion-doped perovskite oxide phosphors are crucial for white light-emitting diode devices. In this study, high-performance red phosphors SrIn 1.95- x O 4 :0.05Eu 3+ , x Y 3+ (SIO:0.05Eu 3+ , x Y 3+ , 0 ≤ x ≤ 0.3) and SrY 1- x InO 4 : x Eu 3+ (SYIO: x Eu 3+ , 0 ≤ x ≤ 0.3) were synthesized using high-temperature solid-phase method. The energy bandgap of the new host material, SrYInO 4 is larger than that of SrIn 2 O 4 . The synthesized series of red phosphors exhibit good crystallinity and electronic structure. Under 308 nm excitation, SIO:0.05Eu 3+ ,0.1Y 3+ and SYIO:0.2Eu 3+ show the highest luminescence intensity within their respective series, emitting red light at around 616 nm. Their luminescence intensity is 2.2 times and 4 times higher than the previously reported SrIn 1.95 O 4 :0.05Eu 3+ red phosphors, respectively. Additionally, SIO:0.05Eu 3+ ,0.1Y 3+ , and SYIO:0.2Eu 3+ display high color purity (87.1 % and 96.5 %, respectively), microsecond level fluorescence lifetime and excellent thermal stability. SIO:0.05Eu 3+ ,0.1Y 3+ , and SYIO:0.2Eu 3+ show significant potential for application as red-emitting components in WLED devices.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Qi Chen,Fang Lei,Ying Shi,Luqiao Yin,Xiaoxiao Ji,Jianjun Xie,Lei Zhang,Lingcong Fan
The all-inorganic perovskite CsPbI 3 quantum dots are difficult to achieve pure red stable luminescence due to their poor lattice thermodynamic stability and non-radiative recombination loss caused by surface halide vacancies. Therefore, the pure red perovskites are usually achieved by mixing the composition of halides (Br and I). In this work, CsPb(Br/I) 3 quantum dots (QDs) were synthesized by the hot-injection method under the synergistic effect of homophthalic acid (HA), 2-bromoethanesulphonic acid sodium salt (SBES), and oleylamine (OAm). By adjusting the molar ratio of passivates, the synergistic effect of multiple ligands can not only passivate the unliganded Pb 2+ -related defects on the surface of NCs, but also increase the formation energy of halide vacancies. Meanwhile, due to the bidentate structure of HA, smaller size of perovskites nanocrystals were obtained. Eventually, synergistic boost in device performance is achieved for color-by-blue white light-emitting diodes (WLEDs) with CIE coordinates of (0.3319, 0.3297) and have an external quantum efficiency (EQE) of 10.13%. This strategy paves an efficient way for improving the efficiency and stability of CsPb(Br/I) 3 NCs.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
钙钛矿量子点
·
发光二极管（LED）
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Hezhen Wu,Huidong Tang,Qing Hu,Yanqiao Xu,Wentao Li,Xiaojun Zhang,Feng Jiang,Guo Feng,LianJun Wang,Wan Jiang
Recently, vacancy-ordered double perovskite phosphors have garnered significant attention due to their high quantum efficiency, elevated carrier mobility, and favorable fluorescence properties. Vacancy ordered double perovskite phosphors has poor fluorescence properties due to the high number of vacancies. The fluorescence characteristics and stability can be enhanced through strategic ion doping. This study synthesized Zr 4+ ion-doped Cs 2 SnCl 6 : 5 %Te using hydrochloric acid-assisted precipitation method. The inclusion of Zr 4+ ions in proper proportions facilitated Jahn-Teller structural distortion in Te 4+ , thereby enhancing the generation of bright yellow-green emission. The photoluminescence quantum yield (PLQY) achieved a peak of 70.9 % at a Zr 4+ ion doping level of 15 %. Furthermore, a water stability test was conducted on the phosphors. At 15 % doping with Zr ions, The Cs 2 Zr 0.15 Sn 0.8 Cl 6 : 5 %Te phosphors demonstrated a remarkable stability, which maintained 100 % of its initial fluorescence intensity after immersion in water for 14 h, proving the excellent stability of the phosphors against water exposure. A white light-emitting diode (WLED) with color coordinates of (0.3486, 0.364), a correlated color temperature of 4915 K, and a color-rendering index (Ra) of 86 was prepared using Cs 2 Zr 0.15 Sn 0.8 Cl 6 : 5 %Te phosphor. This development offers a novel and eco-friendly approach to solid state lighting.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
OPTICAL MATERIALS
·
2026
·
IF 4.3
Siyu Qin,Yanzhao Liu,Zhanghan Qin,Yi Zhu,Yulong Zhao,Meirong Sui,Feng Tong,Xiuquan Gu
All-inorganic red-emitting CsPbI 3 perovskite quantum dots (PQDs) suffer from cubic-phase instability and iodide ion migration, causing phase separation and emission quenching. This work demonstrates that lattice-level Br/I homogenization is essential for stable red emission, rather than physical blending or surface doping. Through systematic compositional screening of CsPb(Br/I) 3 solid solutions, CsPbBr 1 I 2 is identified as the optimal composition, delivering pure emission at 640 nm. Br incorporation strengthens Pb–Br bonds, passivates halide vacancies, and synergistically suppresses phase transitions and ion migration. As a result, CsPbBr 1 I 2 PQDs exhibit an ultralong fluorescence lifetime of 288 ns and retain over 70% of initial photoluminescence (PL) intensity under combined heat, water immersion, and light stresses, whereas control samples retain only 30−40%. A prototype white light-emitting diode (WLED) backlight display fabricated with these PQDs achieves a color gamut covering 127.07% NTSC and 94.88% Rec.2020, delivering vivid, saturated colors. This work provides a reliable compositional regulation strategy and theoretical foundation for perovskite-based wide-color-gamut displays.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
C.X. Chen,X.Z. Zheng,W.B. Dai,C.Y. Ni,W.Y. Li,D. Wu
As energy consumption intensifies, energy saving and environmentally friendly phosphor-converted white light-emitting diodes (pc- w LEDs) have become the current research hotspots. The garnet-based CaY 2 Al 4 SiO 12 (CYAS) phosphors, with their abundant lattice sites and stable physical properties, are ideal candidates as phosphor hosts. Through comprehensive experimental and theoretical analyses, including XRD/Rietveld refinement and density functional theory (DFT) calculations, it was determined that Bi 3+ /Tb 3+ /Sm 3+ ions preferentially occupy the Y 3+ lattice site. The luminescence properties and thermal stability of CYAS: Bi 3+ /Tb 3+ /Sm 3+ have been extensively investigated. The quantum yield (QY) has been enhanced to 48.3 % due to energy transfer (ET), which is not a significant difference compared to existing phosphors, and by superposition of blue (Bi, 3 P 1 → 1 S 0 ), green (Tb, 5 D 4 → 7 F 5 ), and red (Sm, 4 G 5/2 → 6 H 5/2 ) emission, resulting in tunable spectrum and high-quality, full-spectrum white light emission. Finally, the w LED device with high color rendering index (CRI, 87), high luminous efficiency (LE, 74 lm·W −1 ), and low correlated color temperature (CCT, 4747.56 K) were fabricated by a remote ‘encapsulation’ packaging strategy, suggesting that the phosphor can be applied to high quality white light illumination.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xingyang Peng,Rongmao Li,Hao Guo,Weihai Chen,Kang Wang,Can Yuan,Xiang Guo,Chaoyong Deng,Ruirui Cui
Existing phosphor materials can hardly meet the demands of multi-scenario applications. The importance of developing novel Sm 3+ doped phosphors with both excellent thermal stability and multifunctional properties is thus emphasised. This paper presents a systematic study of the multifunctional red phosphor Ba 6 La 2 Ga 4 O 15 :Sm 3+ . Under 406 nm excitation, the material exhibits a characteristic red-light emission of 601 nm. Thermal stability tests showed that its luminescence intensity at 423 K maintained 81.84 % of room temperature. The thermometry performance based on the FIR method showed a maximum relative sensitivity of 1.89 %/K and an absolute sensitivity of 0.63 %/K in the range of 298 – 473 K. Application studies show that the encapsulated WLED device has a color temperature of 4878 K and a color rendering index of 91.4, making it suitable for high-rendering white light illumination; In addition, the phosphor enables high-contrast imaging of fingerprint features at levels 1 – 3, which significantly improves latent fingerprint recognition rates. In conclusion, BLGO:Sm 3+ phosphors have shown significant application value in the fields of non-contact optical temperature measurement, high-quality solid-state lighting and fingerprint monitoring.
研究领域:
材料科学
·
光学工程
·
固态照明
·
法庭科学
·
传感器与仪器
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Jun Zheng,Linglin Wang,Lei Feng,Yuhan Gao,Feiyao Ren,Siyu Liu,Ting Zhou,Xiaochun Wu,Xin Lai,Daojiang Gao
Recently, Mn 4+ -activated fluoride red phosphors have received intensive attention due to their excellent luminescence properties. However, poor moisture resistance hinders their commercial application. Herein, (K 1- x Cs x ) 2 NbF 7 :Mn 4+ phosphors were designed and synthesized. All the obtained samples are rod-like microcrystals with monoclinic phase structure, Cs + -doping concentration has little influence on the microstructure while significantly impacts their luminescence properties. Specially, the composition optimized (K 1- x Cs x ) 2 NbF 7 :Mn 4+ ( x = 0.3) phosphor has the color purity of 94.20 %, the quantum yield of 53.90 % and the decay lifetime of 3.59 ms. More importantly, the optimized phosphor can maintain 83.20 % of the initial emission intensity after being immersed in distilled water for 1440 min, showing the excellent moisture resistance. A warm WLED with high CRI of 85 and low CCT of 4362 K is achieved by coating the obtained optimized red phosphor in chip. Our work demonstrates that the (K 1- x Cs x ) 2 NbF 7 :Mn 4+ red phosphors possess a great potential application in warm WLEDs.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
ACS Applied Electronic Materials
·
2020
·
IF 0
Yang Peng,Hao Wang,Jiaxin Liu,Qinglei Sun,Yun Mou,Xing Guo
All-inorganic color converters are promising luminescent materials for high-power white lighting due to their excellent heat resistance and high thermal conductivity. However, the low color rendering of converters limits their applications in high-quality lighting. Herein, a broad-band and stable phosphor-in-glass (PiG) was developed for high-power white light-emitting diodes (WLEDs). This PiG converter was fabricated by sintering a green/red phosphor glass film on a glass plate with a patterned metal layer. The green Y3Al3.08Ga1.92O12:Ce3+ phosphor has a broad emission, which compensates for the cyan cavity between blue and green emission spectra, and then produces full-spectrum white light combined with the red CaAlSiN3:Eu2+ phosphor. The all-inorganic WLEDs were realized by welding the PiG on a substrate. The optical performance of PiG-based WLEDs was optimized by varying the film thickness. At the film thickness of 150 μm, the fabricated WLEDs achieve ultrahigh color quality of color rendering index (CRI) values (Ra = 95.4, R9 = 95.1, and R13 = 97.3) and fidelity/gamut index values (Rf = 91 and Rg = 102). The corresponding luminous efficacy (LE) and correlated color temperature (CCT) are 65 lm/W and 5260 K, respectively. After aging at 100 °C for 200 h, the PiG-based WLEDs exhibit low efficiency loss and stable color quality compared with the traditional phosphor-in-silicone (PiS)-based WLEDs. The prepared PiG is a broad-band and stable converter enabling ultrahigh color rendering for high-power white lighting.
研究领域:
材料科学
·
光学工程
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DOI
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Shengan He,Fanfan Xu,Tiantian Han,Zeqin Lu,Wei Wang,Jiaqing Peng,Fu Du,Fengli Yang,Xinyu Ye
Red-emitting phosphors composed of Mn 4+ -activated fluorides have attracted considerable interest for their applications in warm white light-emitting diodes (WLEDs). However, in addition to moisture instability, the unsatisfactory thermal stability of these phosphors limits their industrial applications. In this study, a novel red phosphor of CsMoO 2 F 3 :Mn 4+ was synthesized via simple coprecipitation. This red phosphor exhibits an orthorhombic structure with a bandgap of ~3.43 eV. The Mn 4+ ions occupy Mo 6+ sites at the centers of [MoO 2 F 4 ] 2− octahedrons. This phosphor shows narrow emission around ~633 nm excited by 450 nm blue-chip with high color purity of 99.58%. Satisfactorily, this phosphor exhibits excellent thermal stability and a strong negative-thermal-quenching. The total PL intensity of CsMoO 2 F 3 :3.88%Mn 4+ phosphor at 275 K strengthens to ~540% relative to that at 25 K, and its relative emission intensity preserves about 129.3% when the temperature rises from room temperature to 423 K (150 ℃). It also shows admirable color stability with a slight chromaticity shift ( ΔE ) of only ~ 33.9 × 10 - 3 in the temperature region from 298 to 473 K. Furthermore, a warm WLED was fabricated by the mixture of red-emitting CsMoO 2 F 3 :3.88%Mn 4+ and the yellow-emitting YAG:Ce 3+ phosphors with a blue-emitting InGaN LED chip. The device exhibits low correlated color temperature (3983 K) and high color-rendering index (Ra = 81.3). With the increasing drive current from 20 mA to 120 mA, the chromaticity coordinate variation (CCV) is only (−0.0163, 0.0202). All these results indicate that the CsMoO 2 F 3 :Mn 4+ phosphor holds tremendous potential for practical applications in high-power lighting and display with high-performance WLEDs.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 14
·4230-4240
·
IF 7
Ziwang Zhang,Nan Yang,Zhuo Li,Jun Chen,Pin Chen,Yiqin Xu,Jianxin Shi,Mingmei Wu
Single-phase white light phosphors for phosphor-converted white light-emitting diodes (pc-WLEDs) have become a hot spot and attracted considerable attention. However, the unsatisfactory luminous efficiency and colour rendering index of this kind of device hinder their large-scale applications in the field of lighting. Herein, a novel multi-centre activated single-phase white light phosphor, Gd2Sr3B4O12:Ce3+,Tb3+,Sm3+, has been designed and prepared. The crystal structures of the host and the doped samples are characterized with XRD and Rietveld refinements. The band gap of the host calculated with the density functional theory is consistent with the value obtained from the UV-Vis reflection spectrum. Benefiting from the energy transfer paths of Ce3+–Tb3+, Ce3+–Sm3+ and Tb3+–Sm3+, which are quantitatively evaluated with photoluminescence spectra and decay curves, the intensities of the characteristic emission peaks of the three dopants are found to be closely interlocked and the emission colour of the phosphors can be precisely tuned by adjusting the relative ratio of the three ions. Under the excitation of near-UV light, the two phosphors of Gd2Sr3B4O12:0.03Ce3+,0.18Tb3+,0.05Sm3+ and Gd2Sr3B4O12:0.03Ce3+,0.22Tb3+,0.07Sm3+ emit white light with CIE coordinates of (0.32, 0.35) and (0.34, 0.34), and the quantum efficiencies are 46.8% and 34.9%, respectively. The temperature-dependent photoluminescence spectra of the phosphors show that the quenching temperature (T50%) is as high as 450 K. Finally, WLED devices with maximal colour rendering index of 87.5 are obtained by fabricating the two single-phase white light phosphors with 365 nm LED chips. The balanced and preferable comprehensive performances of Gd2Sr3B4O12:Ce3+,Tb3+,Sm3+ demonstrate that the as-prepared single-phase white light phosphor can be a promising candidate for fabricating near-UV chip-based WLEDs.
研究领域:
材料科学
·
光电技术
·
照明技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）