Inorganic Chemistry Frontiers
·
2020
·Vol. 7
·期 10
·2060-2071
·
IF 5.958
Lei Qiu,Hang Yang,Zhigao Dai,Fengxu Sun,Jiarui Hao,Mengyu Guan,Peipei Dang,Chunjie Yan,Jun Lin,Guogang Li
Poor stability of CsPbX3 (X = Cl, Br or I) perovskite quantum dots (QDs) has greatly hindered their practical photoelectric applications, and how to improve it still remains a critical challenge. Herein, we encapsulated CsPbBr3 QDs into dual-shell hollow silica (SiO2) spheres via a simple successive ionic layer adsorption and reaction (SILAR) method. The hierarchical dual-shell structures permit CsPbBr3 QDs to be anchored on the interior of the SiO2 spheres while keeping the outside surface undisturbed, which can protect the CsPbBr3 QDs from direct exposure to the atmosphere. Due to the comprehensive protection of dual-shell hollow SiO2 spheres, the CsPbBr3/SiO2 nanospheres exhibit markedly enhanced stability against light and heat, with a residual PL intensity of 89% after continuous exposure for 72 h to UV light and 65% after 100 °C heat treatment, respectively. In addition, an optimal PLQY of 89% is obtained with suppressed nonradiative recombination. Finally, the fabricated white light-emitting diode (LED) device by employing CsPbBr3/SiO2 green phosphors could achieve a wide color gamut covering up to 136% of the NTSC standard. This work provides a novel SiO2-based encapsulation approach to solve the intrinsic instability issues of CsPbBr3 QDs, which has a profound impact on their practical applications.
研究领域:
材料科学
·
纳米技术
·
光电技术
✓ 已验证
DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2020
·Vol. 9
·期 3
·036003
·
IF 2.142
Xiaoyu Zhang,Peiyuan Cao,Bobo Yang,Yunlong Gao,Xun Hong,Yu Ming,Fei Zheng,Yaoqing Chu,Jun Zou
Embedding cesium lead bromide perovskite quantum dots (PQDs) into silica matrix has been proved as an efficient way to enhance the stability of PQDs. Here, we firstly report 3-(Dimethoxymethylsilyl)propylamine (DEMSPA) as a precursor to form coating shell. The PQDs solution and DEMSPA were mixed in the open air at the room temperature. The final product was extracted from the sol-gel solution. The luminescent properties of QDs is over 60 d of storage under ambient conditions. The PQDs/SiO2 composite powder possesses the photoluminescence quantum yield (PLQY) of 63.5%. Coating the powder on the blue chips, the white light-emitting diode (LED) exhibits a wide color gamut with 123.6% of National Television System Committee (NTSC) color triangle area. The PQDs/SiO2 composite has been proved cubic phase structure, indicating good crystallinity. The good crystallinity enables QDs to be applied as broad optoelectronic devices.
研究领域:
材料科学
·
纳米技术
·
光电
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Jianyan Ding,Dewu Wu,Shanshan Ye,Quansheng Wu
The advancement of narrow-band cyan-emitting phosphors activated by near-ultraviolet LED chips is crucial for creating high-efficiency, health-promoting WLED lighting. Guided by a single and symmetrical crystallographic site, a near-ultraviolet excitation, near-narrow-band, and thermally stable cyan light emission was achieved from Bi 3+ -activated garnet-structured Ca 3 Xn 2 Ge 3 O 12 :Bi 3+ (Xn = Sc, Y, Lu). When incorporated into WLEDs, the color rendering index (CRI) of devices containing Ca 3 Sc 2 Ge 3 O 12 :Bi 3+ cyan phosphor reaches 92.8, indicating potential value for healthy lighting applications. Furthermore, by integrating spectral and crystallographic data with empirical formula calculations, a comprehensive analysis of the luminescence behavior among the three Ca 3 Xn 2 Ge 3 O 12 :Bi 3+ (Xn = Sc, Y, Lu) phosphors were performed. This analysis was designed to elucidate the similarities and differences in their luminescence properties, as well as to uncover the underlying mechanisms responsible for the near-narrow-band emission of Bi 3+ . The results indicate that under the combined influence of factors volume polarization, fractional covalency, and charge of the anions, Ca 3 Xn 2 Ge 3 O 12 :Bi 3+ (Xn = Sc, Y, Lu) exhibits the same strongest excitation peak. However, due to variations in Stokes shift and bandgap, the three phosphors exhibit distinct emission peaks and thermal quenching properties. This study aims to establish fundamental principles for the development of Bi³ ⁺-activated narrow-band emission phosphors.
研究领域:
材料科学
·
光学材料
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固态照明
·
无机化学
·
晶体学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Chengyu Ni,Kaiting Wu,Chunxuan Chen,Xiaozhou Zheng,Man Xu,Wubin Dai
The design of a stably efficient and color-tunable photoluminescence (PL) phosphor, depending on the clear relationship between structure/composition and PL properties, remains quite a challenge. Herein, in pursuit of phosphor for white LED (wLED) lighting, chemical modification of the host (K3YSi2O7, KYS) and regulation of the energy transfer of dopants Bi3+/Eu3+ in multiple lattice sites (K/Y) are in detail investigated and achieved via a facile solid-phase reaction under air condition. Based on both experimentally and theoretically comprehensive analysis of structure (i.e., XRD/Rietveld refinement, density functional theory (DFT) calculations) and steady/transient-state spectroscopy (i.e., PL/PL excitation, decay lifetime), the adjustable and broad PL in the blue/cyan region of Bi3+ is originated from both the crystallographic sites of K1/Y2, while Eu3+ ions are more inclined to enter the Y2/Y1 sites and emit the characteristic high-purity red PL. Systematic PL tuning from blue/cyan to red is thus realized via efficient ET from Bi to Eu, and the corresponding PL and ET mechanisms are discussed and proposed. Intriguingly, significant enhancements of the PL intensity, quantum yield (QY), and thermal stability of the KYS: Bi/Eu are achieved via chemical composition modulation by artificially adding excessive K+ ions to the host to enhance the phase purity/crystallinity. By adopting the phosphor as a “warm” white color convertor, a wLED with high efficiency and color rendering index (CRI, 90.5) and low corrected color temperature (CCT, 4126 K) is constructed via a remote “capping” packaging strategy. Further, in view of the different thermal responses of the multisite occupancy of Bi3+, energy-level thermal coupling of Eu3+, and dual centers of Bi/Eu in KYS, a multimode and self-referenced thermometer is also designed based on the fluorescence intensity ratio (FIR) technology with high relative sensitivity.
研究领域:
材料科学
·
光学材料
·
固态照明
·
发光材料
·
温度传感技术
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无机化学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Ya Chu,Weiqiang Zhang,Baoye Hu,Jinghong Wen,Mengmei Qin,Guangjiu Zhao
Regulation of surface ligands in hybrid organic–inorganic perovskite quantum dots (HOIP QDs) is key to enhancing their optoelectronic properties. However, achieving both high photoluminescence (PL) and long-term stability in chiral HOIP QDs remains challenging. Here, we report the use of chiral anthraquinone derivatives (AQ) as surface ligands, replacing conventional long-chain alkyl ligands, to construct two potassium-doped chiral QDs, (R)AQ-QDs and (S)AQ-QDs. These QDs exhibit high photoluminescence quantum yields (PLQYs) of 98.74 and 97.68%, respectively, along with notable stability. Optical characterization indicates an efficient chirality transfer from the organic ligands to the K0.23MA0.77PbBr3 lattice. Furthermore, density functional theory (DFT) calculations and femtosecond transient absorption (fs-TA) spectroscopy reveal reduced surface trap states, as evidenced by stronger ligand binding and prolonged carrier lifetimes. A white-light-emitting diode (LED) fabricated using the AQ-QDs shows a color rendering index (CRI) of 65.1 and a correlated color temperature (CCT) of 6169 K. The reported work highlights the potential of chiral ligand engineering in improving PL efficiency and stability in perovskite QDs.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 9
·e70374
·
IF 0
Quanfeng Ye,Lingyi Li,Jie Zhang,Mingyu Teng,Fengshou Wu,Deman Han
Salen-type Schiff-base ligands (H 2 L) were synthesized through the condensation reaction between 1,2-diphenylethane-1,2-diamine and o-vanillin. Three novel luminescent Zn-Ln complexes, [ZnL] 2 Ln (Ln = Gd, Tb, Eu), were successfully prepared by reacting the zinc complex (ZnL) with LnCl 3 . Subsequent treatment of [ZnL] 2 Ln with dibenzoylmethane yielded three dinuclear derivatives, β-[ZnL]Ln (Ln = Gd, Tb, Eu). All complexes were comprehensively characterized by single-crystal X-ray diffraction and FT-IR spectroscopy. Structural analyses revealed that complexes 1–3 adopt trinuclear Zn-Ln-Zn architectures, whereas complexes 4–6 exhibit dinuclear Zn-Ln configurations. Solid-state photoluminescence measurements demonstrated quantum yields of 27.94% (ZnL), 0.90% ([ZnL] 2 Eu), 1.82% ([ZnL] 2 Tb), 1.05% ([ZnL] 2 Gd), 0.65% (β-[ZnL]Eu), 1.16% (β-[ZnL]Tb), and 0.70% (β-[ZnL]Gd), indicating their potential as advanced fluorescent rare-earth materials. The LED devices based on complexes β-[ZnL]Eu and β-[ZnL]Tb exhibit stronger emission intensities compared to those based on complexes [ZnL] 2 Eu and [ZnL] 2 Tb. The obtained complexes were fabricated in LED; the CIE chromaticity coordinates of complexes β-[ZnL]Eu and β-[ZnL]Tb are (0.344, 0.316) and (0.347, 0.323), respectively, which are very close to the standard white light coordinates (0.33, 0.33).
研究领域:
无机化学
·
材料科学
·
配位化学
·
光学材料
·
固态照明
✓ 已验证
产品关联
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Tenglong Sun,Man Nie,Mengmeng Meng,Bingpeng Li
White light-emitting diodes (wLEDs) face challenges in achieving both high efficiency and color quality due to limitations in conventional phosphor-in-glass (PiG) materials. To address this, we developed an active glass matrix by doping borosilicate glass (B 2 O 3 -SiO 2 -K 2 O-Al 2 O 3 ) with Eu 3+ ions, which serves as both a host and red emitter for Lu 3 Al 5 O 12 : Ce 3+ (LuAG) phosphor. The resulting PiGEuB-1LCe composite shows excellent interfacial stability and retains 94.5 % of its luminescence intensity at 473 K. Under 400 nm excitation, the optimized PiG produces balanced white light with a high color rendering index (CRI) of 80.1 and tunable correlated colour temperature (CCT, 5146 K), demonstrating superior performance for next-generation wLED applications.
研究领域:
材料科学
·
光学材料
·
固态照明
·
光子学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 23
·8547-8554
·
IF 6.1
Qianyi Chen,Zhenjie Lun,Dongdan Chen,Yongsheng Sun,Puxian Xiong,Siyun Li,Shanhui Xu,Zhongmin Yang
The development of extra-broadband visible emission phosphors is crucial to achieve next-generation illumination with better color experience. Herein, a defect engineering strategy mediated by the structural cationic substitution is proposed and experimentally demonstrated for specific ultra-broadband emission in a garnet phosphor. The induced oxygen vacancies and interstitial cation through lattice distortion break the periodic potential field of the crystal and provide electronic levels in the band gap. As a result, excited by blue-light-emitting diodes, the novel Y3Sc2Al3O12:B3+ shows an ultra-broad emission with a full width at half maximum (FWHM) of ∼170 nm. Compared to general defect-emitting phosphors, the unique Y3Sc2Al3O12:B3+ exhibits excellent thermal quenching resistance and superior internal quantum efficiency of up to 95%. These findings not only show great promise of Y3Sc2Al3O12:B3+ as an extra-broadband emitter but also provide a new design strategy to achieve a full-visible-spectrum phosphor in a single-component material for white-light applications.
研究领域:
材料科学
·
光电技术
·
光子学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Chao Li,Ying Li,Yi Xu,Jiyou Zhong
Near-infrared (NIR) phosphors as crucial components of NIR light sources have multifunctional and smart spectroscopy applications, prompting an increasing research interest in developing efficient and stable NIR materials. Focusing on this issue, the present study explored the luminescent properties of Cr 3+ -doped Ca 3 ZnMGe 3 O 12 (M = Zr, Hf, Sn and Ti) garnet family. These materials exhibit an emission peak falls within the range of 785–805 nm with a full width at half maximum (FWHM) varying from 114 to 123 nm. Among them, the Ca 3 ZnZrGe 3 O 12 :Cr 3+ phosphor shows the highest photoluminescence quantum yield (PLQY = 60.3 %) and an excellent thermal stability ( I 423K / I 298K = 77.51 %). Moreover, the performance of a prototype Ca 3 ZnZrGe 3 O 12 :Cr 3+ -containing NIR pc-LED device was estimated, which achieves an NIR output of 23.46 mW and a photonic efficiency of 14.09 % under 100 mA driving current. Non-destructive examination can be realized using this light source, demonstrating the good potential of the material in NIR spectroscopy applications.
研究领域:
材料科学
·
光电技术
·
光子学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Jia Yang,Lifang Yuan,Di Qian,Haoyi Wu,Yahong Jin
Broadband near-infrared phosphor-converted LED (NIR pc-LED) light sources have attracted considerable attentions due to their widespread applications in active security defense, nondestructive detection, and online chemometric analysis. The broadband NIR phosphor, determining the overall performance of NIR pc-LED, is still to be explored. In this study, a series of CdGa 2-x O 4 :xCr 3+ phosphors are prepared by a solid state reaction. Owning to the electron population in 2 E and 4 T 2 energy levels of Cr 3+ ions with an intermediate crystal field, CdGa 2 O 4 :Cr 3+ exhibits a sharp line and broad band overlapped NIR emission spectrum, covering 600–1300 nm with a peak wavelength ( λ max ) of 740 nm and a full width at half maximum (FWHM) of 160 nm. A robust luminescence thermal stability that the NIR emission intensity remains 95 % of the initial level at 423 K is achieved, caused by a weak electron-phonon coupling (EPC) effect. Finally, a prototype NIR pc-LED is fabricated by using the as-obtained broadband NIR phosphor to demonstrate the application for night vision.
研究领域:
材料科学
·
光电技术
·
光子学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 31
·11791-11802
·
IF 4.052
Baochen Wang,Ruiyu Mi,Yangai Liu,Ming Yu,Zhaohui Huang,Minghao Fang
The luminescence spectra of some trivalent rare-earth ions in a garnet host present interesting multisite structures; however, their mechanism is still not fully understood. In this study, for the first time, we directly observed two luminescence centers of Ce3+ at a single site in a novel garnet Ca3Sc2Ge3O12 phosphor. The spectral characteristics of the two luminescence centers were clearly identified using site-selective and time-resolved spectroscopy. Luminescence excitation was observed at 425 nm and 450 nm, corresponding to emissions at 490 (Ce(I)) nm and 530 (Ce(II)) nm. The decay curves confirmed the existence of energy transfer from Ce(I) to Ce(II). The potential mechanisms of the multisite luminescence are also discussed. This study gives a new insight into the concentration-dependent red-shift and inhomogeneous broadening of the Ce3+ emission band in the garnet phosphor. The title phosphor showed excellent thermal stability, with more than 90% of the initial intensity at the functioning temperature (323 K). Finally, a white LED lamp was fabricated, which exhibited an excellent color rendering index (82.3) and a proper correlated color temperature (3582 K). These results demonstrate that Ca3Sc2Ge3O12:Ce3+ is highly promising to serve as a blue-pumped phosphor for white LEDs.
研究领域:
材料科学
·
光电技术
·
光子学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 22
·5960-5968
·
IF 7.779
Qiqiong Ren,Jian Zhang,Maxim S. Molokeev,Guojun Zhou,Xian-Ming Zhang
Low-dimensional metal halides have emerged as promising platforms for the development of new-generation phosphor-converted light emitting diodes (pc-LEDs), in which zero-dimensional (0D) hybrids with lone-pair ns2 states, in particular, show unprecedented competitiveness owing to their fascinating photoluminescence (PL) properties. Herein, we designed a novel 0D indium hybrid, (C20H20P)2InCl5, and proposed a co-doping strategy to incorporate Bi3+ (6s2) and Sb3+ (5s2) ions into this indium hybrid. Widely tunable emissions from blue to red are achieved, which are assigned to the triplet self-trapped excitons (STEs) (3P1 → 1S0) of Bi3+ (476 nm) and Sb3+ (658 nm), respectively. Importantly, an uncommon triplet–triplet energy transfer from Bi3+ to Sb3+ contributes to tunable dual emissions, and enables a single-phase cool white-light emission under ultraviolet (UV) excitation. Moreover, the energy transfer mechanism is discussed clearly by fluorescence photon dynamic analysis and DFT calculations. This work provides a deeper insight into triplet–triplet energy transfer, as well as presents a new model system for tuning the PL behaviours of ns2 configuration dopants.
研究领域:
材料科学
·
光电技术
·
光子学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）