Small
·
2022
·Vol. 18
·期 15
·2108120
·
IF 15.153
Zhongjie Cui,Shiliang Mei,Zhuoqi Wen,Dan Yang,Shuaitao Qin,Zhiyong Xiong,Bobo Yang,Haiyang He,Rui Bao,Yi Qiu,Yuanyuan Chen,Wanlu Zhang,Fengxian Xie,Guichuan Xing,Ruiqian Guo
InP quantum dots (QDs) have attracted much attention owing to their nontoxic properties and shown great potential in optoelectronic applications. Due to the surface defects and lattice mismatch, the interfacial structure of InP/ZnS QDs plays a significant role in their performance. Herein, the formation of In–S and S x –In–P 1− x interlayers through anion exchange at the shell-growth stage is revealed. More importantly, it is proposed that the composition of interface is dependent on the synergistic effect of halogen ions and shelling temperature. High shelling temperature contributes to the optical performance improvement resulting from the formation of interlayers, besides the thicker ZnS shell. Moreover, the effect relates to the halogen ions where I − presents more obvious enhancement than Br − and Cl − , owing to their different ability to coordinate with In dangling bonds, which are inclined to form In–S and S x –In–P 1− x bonds. Further, the anion exchange under I − -rich environment causes a blue-shift of emission wavelength with shelling temperature increasing, unobserved in a Cl − - or Br − -rich environment. It contributes to the preparation of highly efficient blue emissive InP/ZnS QDs with emission wavelength of 473 nm, photoluminescence quantum yield of ≈50% and full width at half maximum of 47 nm.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 25
·7636-7642
·
IF 6.641
Fei Chen,Peiwen Lv,Xu Li,Zhenbo Deng,Feng Teng,Aiwei Tang
We report highly-efficient red-emitting InP/ZnS-based quantum-dot light-emitting diodes (QD-LEDs) fabricated via an all-solution-processed technique, in which colloidal ZnO nanoparticles (NPs) with tailoring compositions act as the electron transport layers (ETLs). The optical band gap, energy level and charge injection capability of ETLs can be manipulated by incorporation of various metal dopants with different valence states and ionic radii into ZnO NPs, and the QD-LEDs with ZnO:Mg NPs as the ETL exhibit a superior device performance over other counterparts. By rational passivation of Cl ions on the surface of ZnO:Mg NPs, a record external quantum efficiency (ηEQE) of 4.24% is successfully realized in the all-solution-processed red-emitting InP/ZnS-based QD-LEDs. The maximum luminance reaches a record 5595 cd m−2. The Cl@ZnO:Mg NPs not only provide a well-matched charge balance but also prevent interfacial exciton dissociation, boosting the enhancement of device performance. This work shows an effective composition-modulated interfacial engineering strategy for improving the performance of all-solution-processed QD-LEDs.
研究领域:
材料科学
·
光电工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICS COMMUNICATIONS
·
2018
·
IF 1.887
Wu Yang,Wanlu Zhang,Guilin Zhang,Jiatao Zhu,Guoxing He,Ruiqian Guo
We reported two types of tunable white LEDs (WLEDs) based on high quality the single emissive InP/ZnS quantum dots (QDs) and the dual emissive Ag:InP/ZnS QDs via myristic acid (MA) passivation and Ag doping. The WLEDs with three color InP/ZnS QDs could realize color rendering indices (CRIs) of 97–98, color quality scales (CQSs) of 94–98, and limited luminous efficacies (LLEs) of 238–246 lm/W at correlated color temperatures (CCTs) of 2700 K to 6500 K, and the WLEDs with dual emissive Ag:InP/ZnS and red emissive InP/ZnS QDs could realize CRIs of 90–93, CQSs of 90–93, and LLEs of 223–242 lm/W at CCTs of 2700 K to 4000 K. Finally, their luminous efficacies were estimated.
研究领域:
材料科学
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光学工程
·
半导体技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2025
·
IF 4.9
Ziqiang Tian,Maoyuan Huang,Qi Zhong,Xiaomeng Gong,Jia Guo,Ruiqian Guo,Changchun Wang
The design and fabrication of photonic crystals with multiple optical states are significant and urgently desired. However, most conventional photonic crystals with scalable potential display only a single structural color mode, limiting their practical application. Herein, we successfully achieved a new type of dual-mode photonic crystal films through the co-assembly of polymer colloidal core@shell nanoparticles and InP@ZnS quantum dots at room temperature. The co-assembly process was completed with high efficiency by a powerful assembly technique called molecule-mediated shearing-induced assembly technique (MSAT). The obtained dual-mode photonic crystal films possessed two distinct optical states, including a structural color mode and a fluorescent color mode. The advantages of both photonic band gaps and fluorescence emission were synchronously integrated, exhibiting bright structural colors and vibrant fluorescent colors under sunlight irradiation and ultraviolet excitation, respectively. The switch of the two optical states was highly reversible and stable. Besides, we also found that the dual-mode photonic crystal films realized enhanced fluorescent emission from the slow photon effect, and the relationship between the fluorescence enhancement effect and order degrees of dual-mode PC films was studied. Finally, the dual-mode photonic crystal films were employed to design a visual coding-decoding system, and also as raw materials to produce anti-counterfeiting photonic paints. All the experiments provided a novel insight for achieving multiple optical states within a single system, creating opportunities for extending the application of photonic crystals in the realm of information storage, anti-counterfeiting, response materials, and pattern display.
研究领域:
光学材料
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光子学
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纳米技术
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材料科学
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荧光光谱学
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信息安全
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防伪技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）