NANOTECHNOLOGY
·
2018
·Vol. 29
·期 28
·285706
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IF 3.404
He Shao,Xue Bai,Gencai Pan,Haining Cui,Jinyang Zhu,Yue Zhai,Jingshi Liu,Biao Dong,Lin Xu,Hongwei Song
Inorganic perovskite quantum dots (QDs) have attracted wide attention in display and solid-state lighting because of their easily tunable band-gaps and high photoluminescence quantum yields (PLQY) of green light emission. However, some drawbacks limit their practical applications, including the low PLQY of blue light emission and the instability in the moisture environment. In this work, efficient blue-light emitting CsPbBr3 perovskite QDs with PLQY of 72% were developed through a bandgap engineering approach. The achieved blue-light emitting PLQY is much higher than the values acquired in the inorganic perovskite QDs in the literature. And the emission color of the as-prepared QDs can be facially tuned by only adjusting the reaction temperature. Further, the mono-dispersed perovskite QDs@SiO2 composites were constructed benefiting from the low temperature synthesis. The optical performance of the QDs could be well persisted even in the moisture environment. Finally, the as-prepared QDs@SiO2 composite was fabricated as the QD ink on the anti-counterfeit printing technology, from which the obtained pattern would emit varied color under UV lamp. And the as-prepared composites was also applied for fabricating WLED, with Commission Internationale de l'Eclairage (CIE) color coordinates of (0.33, 0.38) and power efficiency of 32.5 lm W−1, demonstrating their promising potentials in solid-state lighting.
研究领域:
材料科学
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纳米技术
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光电
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固态照明
✓ 已验证
DOI
高影响因子
Nano Research
·
2024
·
IF 9.5
Yan Danni,Dong Yuhui,Wei Naiwei,Yang Shuai,Zhu Hong,Gu Wanzhong,Zou Yousheng,Zeng Haibo
Quaternary Ag-In-Ga-S (AIGS) quantum dot (QD) is considered a promising, spectral-tunable, and environmentally friendly luminescent display material. However, the more complex surface defect states of AIGS QDs resulting from the coexistence of multiple elements lead to a low (< 60%) photoluminescence quantum yield (PLQY). Here, we develop a novel convenient method to introduce Z-type ligands ZnX 2 (X = Cl, Br, I) for passivating the surface defects of AIGS QDs to dramatically enhance the PLQY and stability without affecting the crystalline structure and morphology. Results show that the addition of ZnCl 2 during the purified process of AIGS QDs leads to a 3-fold increase of PLQY (from 28.5% to 87%). Impressively, the highest PLQY is up to a recorded value of 92%, which is comparable to typical heavy metal QDs. Exciton dynamics studies have shown that the rapid annihilation process of excitons in treated QDs is inhibited. We also confirm that the improvement in PLQY is a result of the effective passivation of the non-coordinating atom on the QD surface by building a new bonding between sulfur dangling and Zn 2+ . The realization of high PLQY will further promote the application of AIGS QDs in luminescent displays.
研究领域:
材料科学
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纳米技术
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光电技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xin Li,Longxun Teng,Yening Ren,Rui Liu,Xiaoyuan Zhan,Haiqing Sun,Weiwei Zhang,Jianxu Ding,Huiling Zhu
Metal halide perovskite CsPbI3 quantum dots (QDs) have sparked widespread research due to their intriguing optoelectronic. However, the CsPbI3 QDs undergo inevitable aging and luminescence quenching caused by the weak binding ability of oleate (OA–)/oleylammonium (OAm+), hindering further practical application. Herein, we have realized ultrafast rejuvenation of the aged CsPbI3 QDs that have lost their photoluminescence performance based on a 1-dodecanethiol (DDT) surface ligand to restore the outstanding red light emission with a high photoluminescence quantum yield (PLQY) from 25 to 90%. Furthermore, CsPbI3 QDs with DDT surface treatment maintain a cubic phase and high PLQY value even after 35 days. The DDT ligands can form a strong bond with Pb2+ and passivate I– ion vacancies, enhancing radiative recombination efficiency and thereby improving the PLQY of the QDs. The stable yet easily accessible surface of the DDT-capped CsPbI3 QDs was successfully employed as white LEDs and exhibited considerable enhanced luminous performance, suggesting promising application in solid-state lighting fields.
研究领域:
材料科学
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光电技术
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纳米技术
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2025
·
IF 10
Lianhao Huan,Wei Xie,Dongling Geng,Xinxin Miao,Junru Chen,Xinyun Yang,Peiwen Hou,Haibo Zeng
This work employs an ultrafast microwave-assisted synthesis to achieve efficient and uniform Te 4+ doping in Cs 2 ZrCl 6 within 30 min at 60 °C, addressing key challenges of slow kinetics and inhomogeneous distribution prevalent in conventional methods. Structural and optical analyses confirm that temperature and concentration critically govern dopant incorporation and luminescent properties. Temperature-dependent spectroscopy reveals undoped Cs 2 ZrCl 6 hosts dual self-trapped excitons (Zr-STE1 and Zr-STE2) exhibiting excitation-dependent thermally activated delayed fluorescence (TADF) with a minimal singlet-triplet gap (0.060 eV). Te 4+ doping introduces efficient [TeCl 6 ] 2− emitters and modifies energy transfer pathways. Lifetime analysis demonstrates that host TADF, especially synergistic dual-channel activation under 254 nm excitation, enables highly efficient (>83.1%) resonance energy transfer to [TeCl 6 ] 2− centers. Microwave optimization, achieving homogeneous shallow doping, yields an exceptional photoluminescence quantum yield (PLQY) of 95.43% for Cs 2 ZrCl 6 :Te, significantly outperforming conventional syntheses. The material exhibits outstanding stability under thermal, UV, humidity, cycling, and ambient conditions, with prototype LEDs demonstrating superior reliability. These findings establish a synergistic design strategy combining controlled doping and TADF-mediated energy transfer for high-performance luminescence.
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Qiao Huang,Wenya Chen,Xiaojuan Liang,Chunyan Lv,Weidong Xiang
All-inorganic perovskite CsPbX3 (X = Cl, Br, I) nanocrystals (NCs) have generated significant attention in the emerging display industry because of their narrow-band emission, high color purity, and facile preparation and processing. By controlling the deposition of Ag nanoparticles in the B–Si–Zn glass matrix, CsPbBrI2 NC glass with significantly enhanced photoluminescence (PL) intensity (about 6.3 times) was successfully prepared, and the photoluminescence quantum yield (PLQY) is increased from 12.4% to 36.9%. More meaningfully, the high-performance glass powders were incorporated into polystyrene (PS) films through solution and blending techniques, and the films prepared by the latter had superior color coordinates and environmental stability, particularly the intense blue light stability. Under conditions of 60 °C, 90% relative humidity (RH), and 10 000 nit blue light irradiation for 40 d, the PL intensity decline rate of blended film does not exceed 5%. In addition, the light conversion film based on Ag@CsPbBrI2 glass with CsPbBr3 glass powders exhibits a wide color gamut of 125.2% of the NTSC 1953 standard, which shows richer colors than commercial displays on the liquid crystal display (LCD) screen, further opening the space for the development of the quantum dot film industry.
研究领域:
材料科学
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光电技术
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显示技术
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DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2022
·Vol. 128
·期 9
·1-9
·
IF 2.983
Lei Wenshan,Wang Xinzhan,Liu Zhe,Lu Wanbing,Teng Xiaoyun,Cong Ridong,Song Denyuan,Yu Wei
All-in-organic cesium lead halides’ perovskites have shown great potential for light-emitting diodes (LEDs), while the low photoluminescence quantum yield (PLQY) of blue-violet emitting limits their application. In this paper, the blue-violet PL of CsPbCl 3 nanocrystals (NCs) was enhanced by Mn doping first, and the PLQY of which was further increased from 4.0 to 93.8% by the post-synthetic treatment of CdCl 2 . Microstructure analyses suggest that part of Pb ions were substituted by Mn and Cd ions, and the average size of the NCs decrease from 9.09 to 8.06 nm. Optical testing shows that both the improvement of crystalline quality and surface structure contribute to the high PLQY, and crystalline quality improvement caused by ions substitution in the NCs contributes to the stability of optical emission. The high PLQY, ease of preparation, and air stability properties of the Cd–Mn co-doped CsPbCl 3 NCs make it attractive for efficient blue and white LEDs.
研究领域:
材料科学
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纳米技术
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光电
✓ 已验证
DOI
高影响因子
Materials Advances
·
2023
·Vol. 4
·期 10
·2365-2371
·
IF 5
Shaofan Fang,Jinbo Huang,Huixia Li,Jingheng Nie,Zexiang Liu,Feier Fang,Haizhe Zhong
Luminescent metal halides doped with ns2-metal ions, such as 6s2-metal Bi3+, show excellent optoelectronic properties. However, the origin of the high photoluminescence quantum yield (PLQY) of Cs2SnCl6:Bi remains controversial and unclear. In this study, a series of Cs2SnCl6:Bi were synthesized by adopting different tin precursors of SnCl2/SnCl4. The samples from SnCl2 exhibited much higher PLQY than those from SnCl4, and the doping concentrations of Bi3+ had little effect on the high PLQY. When H3PO2 is added to the precursor of SnCl4 to reduce Sn4+ to Sn2+, the prepared Cs2SnCl6:Bi shows bright emission light and high PLQY. The high PLQY of Cs2SnCl6:Bi is attributed to the co-doping of Bi3+ and Sn2+. [SnCl4]2− and two VCl induce a large extra vibrational energy of the heavy localized excitons from [BiCl5]2− to enhance the efficiency of radiative recombination for high PLQY. This work deepens the understanding of the luminescence mechanism of Cs2SnCl6:Bi and supplies significant references for developing more perovskite materials with outstanding luminescence.
研究领域:
材料科学
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光电
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Wenqiang Ma,Huanhuan Zhang,MingXin Hu,Yingnan Guo,Lin Yang
Synthesis of CsPbBr3 nanocrystals (NCs) in the nonpolar solvent at room temperature has made great progress in recent years. However, most of strategies require the use of toluene, which is severely against their large-scale production in future commercialization due to the toxicity concerns. Here, we propose a facile and environmentally friendly strategy to synthesize CsPbBr3 NCs by using n-hexane as the solvent for the first time. Didecyldimethylammonium bromide (DD10AB) can well passivate NCs by the strong bonding of DDA+ with the NC surface, thus improving the colloidal stability. CsPbBr3 NCs with DD10AB post-treatment not only exhibit a narrow emission (FWHM ≈ 17.0 nm) with an ultrahigh PLQY of 96% but also maintain an orthorhombic structure and bright luminescence after 120 days of storage in air. Employing a DD10AB-CsPbBr3 film, a high-performance LCD displays the color gamut of 131% NTSC and 95% Rec.2020, indicating a great potential in the application field of liquid crystal display in the future.
研究领域:
材料科学
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纳米技术
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显示技术
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 25
·9266-9273
·
IF 5.7
Binbin Su,Maxim S. Molokeev,Ran Chen,Tao Zhang
The discovery of novel Mn2+-based metal halides with excellent luminescence properties and thermostability is particularly of great importance for solid-state lighting (SSL). Herein, a novel one-dimensional hybrid manganese chloride (TMA)MnCl3 of a hexagonal system with a P63/m space group is synthesized via a simple saturation crystallization method. Under 443 nm excitation, (TMA)MnCl3 single crystals exhibit a strong broad-band red emission peak at 645 nm originating from the 4T1 → 6A1 transition of Mn2+ ions with a full width at half maximum of 99 nm and a photoluminescence quantum yield (PLQY) of 98.6%. Moreover, (TMA)MnCl3 shows a high anti-thermal quenching behavior, and the integrated PL intensity still retains 100% of the initial intensity measured at 300 °C, caused by the high structural rigidity. Benefiting from its strong blue light excitation, high PLQY, and excellent thermal stability, a stable white light-emitting diode device is fabricated by combining a 465 nm blue LED chip, green-emitting Lu3Al5O12:Ce3+ and the (TMA)MnCl3 red phosphor with a high color rendering index of 94.3% and a correlated color temperature of 3995 K. This work develops a novel hybrid manganese chloride red-emitter and paves a new path to explore high-performance phosphors excited by blue light for SSL.
研究领域:
材料科学
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光电子学
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固态照明
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发光材料
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无机化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ou Hai,Tong Li,Bin Qin,Jian Li,Zechuan Qi,Qiang Ren,Xiulan Wu
While lead-free perovskite has attracted widespread interest in the optical field by overcoming their toxicity and stability disadvantages compared to conventional lead-based perovskite, the low photoluminescence quantum yield (PLQY) of lead-free perovskite has greatly limited their commercialization path. In this research, a modified co-precipitation method was used to prepare Cs 2 ZrCl 6 , which was achieved by the addition of TeCl 4 to shift the emission wavelength from 436 to 556 nm with bright yellow emission, the optimal PLQY of 98.2% was achieved by the addition of Te 4+ in the amount of 1 % and the optimization of the reaction concentration. First-principles calculations and spectral analysis of Cs 2 Zr 1-x Te x Cl 6 show that the broadband yellow light emission comes from self-trapped excitons (STEs) in Cs 2 Zr 1-x Te x Cl 6 . In addition, the luminous intensity of the prepared Cs 2 Zr 1-x Te x Cl 6 was 57.3, 63.3 and 90.1% of the initial intensity after exposure to air for 30 d, cyclic intermittent heating to 200°C and ultraviolet (UV) irradiation for 7 d, respectively. Finally, Cs 2 Zr 1-x Te x Cl 6 and Cs 2 ZrCl 6 :10% Bi were used as phosphors and encapsulated with a UV chip to make three different colors of light-emitting diodes (LED), where the white LED (WLED) had CIE coordinates of (0.3061 0.3244), color temperatures, color rendering indices as well as color tolerances of 6921 K, 84 and 6.52 respectively. This research provides a new approach to improve the performance of lead-free perovskite.
研究领域:
材料科学
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光学
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光子学
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化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 51
·2304743
·
IF 29.4
Huiwang Lian,Wenxia Zhang,Rui Zou,Simin Gu,Rongyi Kuang,Yunfei Zhu,Xinyue Zhang,Chong-Geng Ma,Jing Wang,Yang Li
Compared to solid scintillators and organic liquid scintillators, aqueous-based liquid scintillators (AbLS) have more superiority in highly flexible scalability, yet are now limited by their low light yield (≈100 photons MeV −1 ). Here, aqueous-based inorganic colloidal halide perovskites with high photoluminescence quantum yield (PLQY) of three primary color luminescence up to 88.1% (red), 96% (green), and 81.8% (blue) are respectively synthesized, and a new generation of colloidal perovskite-mediated AbLS (PAbLS) with light yield increased in comparison with the commercial scintillator AbLS is fabricated. This paper exhibits that the excellent PLQY and colloidal dispersion of halide perovskites benefit from poly(ethylene glycol) modification and this modification ensures the vacancy inhibition and formation of defect–free surfaces in an aqueous solution. Moreover, their high luminescent emission can be maintained for 100 days at low temperatures, and such modification also promises the heat-to-cold customization of operating temperature even in ice below 0 °C. Finally, depending on the light yield of around 3058 and 8037 photons MeV −1 at room temperature and low temperature, PAbLS with shape/size scalability exhibit their robust radiation hardness (dose rate as high as 23 mGy s −1 ) and conceptual application potential in high-energy ray radiation detection from every angle of 360°.
研究领域:
材料科学
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核物理
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辐射检测
·
光学材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Yixuan Lv,Yijun Zhang,Le Shi,Jian-Wen Shi,Jun Li,Zhihui Li,Xin Ji,Dandan Ma,Yonghong Cheng,Chunming Niu
As a kind of white light emitting diode (w-LED) with many advantages, rare-earth-free vanadate phosphor has attracted more and more attention. The oxygen vacancies and other surface defects in vanadate oxide have obvious effects on its structure and properties. In order to reveal the specific effects, we heat-treat the original LiCa 3 Mg(VO 4 ) 3 (LCMV) in an oxygen flow with different time to decrease oxygen vacancies, and find that the lattice distortion of [VO 4 ] tetrahedron caused by oxygen vacancy is effectively reduced. Meanwhile, the crystallinity of the treated samples increases, the surface defects decreases, and the fluorescence intensity increases. The variation of photoluminescence quantum yield (PLQY) with oxygen treatment time is as follows: the enhancement effect firstly reaches the strongest (69.34 %) within one hour, then begins to decline after two hours, and finally reaches the platform after three hours and remains basically unchanged. The reason for the enhancement of PLQY is the decrease of oxygen vacancy after one-hour treatment, and the reason for the decrease of PLQY after a further increased treatment time is that the absorption of oxygen and water in air caused by excessive surface defects introduced by oxygen treatment.
研究领域:
材料科学
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光电技术
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固体化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）