OPTICAL MATERIALS
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2019
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IF 2.687
Changhong Li,Ye Li,Tianliang Zhou,Rong-Jun Xie
Mn-doped CsPbCl 3 (CsPbCl 3 :Mn) perovskite colloidal quantum dots (QDs) attract a great deal of interests, and have great potentials for various optoelectronics applications due to their outstanding optical and electrical properties. However, practical applications of CsPbCl 3 :Mn QDs are severely limited by the cumbersome preparation methods and low photoluminescence quantum efficiency (PLQY). Herein, we propose a single-step ultrasonic synthesis method to successfully synthesize CsPbCl 3 :Mn QDs with controlled size and morphology by changing the Mn:Pb ratio. Simultaneously, we introduce triethylamine (TETN) to passivate the surface of CsPbCl 3 :Mn QDs. The phase purity, microstructure, chemical composition and photoluminescence properties of the samples were investigated by means of various analytic techniques. The synthesized QDs exhibit dual emissions of 411 and 601 nm, ascribing to the excitonic emission of QDs and the characteristic Mn 2+ emission, respectively. The quantum yield of the CsPbCl 3 :Mn QDs could therefore be significantly improved from 17.49 to 41.15%. We believe that the facial synthesis method and the surface passivation of TETN can also be applied to other transition metal or lanthanide ions doped lead halide perovskite QDs.
研究领域:
材料科学
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光学工程
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2018
·Vol. 18
·期 11
·7561-7565
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IF 1.354
Wang Kang,You Fangtian,Peng Hongshang,Huang Shihua
All-inorganic cesium lead halide perovskites have attracted a lot of attention as the promising optoelectronic materials because of their excellent and controllable optical and electric properties. The photoluminescence (PL) properties of undoped and Ce3+ doped CsPbCl3
quantum dots (QDs) at different temperatures were studied. The peak wavelength, the intensity of the PL spectra and the full width of half maximum of host QDs emissions present monotonous changes corresponding to the variation of temperature in the range from 22 to 62 °C. Doping with Ce3+
leads to another photoluminescence peak arising from Ce3+ emission. The introduction of Ce3+ ions changed the host QDs emission properties and temperature-dependent characteristics. With the temperature increasing, the emission of host QDs decreased sharply while the
emission of Ce3+ decreased slowly. The florescence intensity ratio between the emission intensities of CsPbCl3 QDs and Ce3+ were calculated to obtain the maximal values of absolute and relative sensitivities of CsPbCl3:Ce3+ QDs. The results
show the potential use of the CsPbCl3 QDs doped with Ce3+ for luminescent thermometers.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
RSC Advances
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2021
·Vol. 11
·期 15
·8430-8436
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IF 3.361
Ronghua Wu,Zhongchen Bai,Jinguo Jiang,Heng Yao,Shuijie Qin
CsPbX3 (X = Cl, Br, and I) quantum dots (QDs) and Cu2+-doped CsPbCl3 QDs with different Cu-to-Pb molar ratios were synthesized via a solvent-based thermal synthesis method. The photoluminescence (PL) properties of these Cu2+-doped CsPbCl3 QDs were also investigated in this study. The results showed that with the increase in the Cl− concentration the surface defects of CsPb(Cl/Br)3 QDs increased, which resulted in an increase in the non-radiative recombination of excitons and weakened the PL intensity. Moreover, Cu2+-doped CsPbCl3 QDs maintained the cubic crystal structure of the initial phases. Owing to the doping of Cu2+ ions, the surface defects of CsPbCl3 QDs were effectively eliminated, which facilitated the excitonic recombination via a radiative pathway. The PL quantum yields (PLQYs) of Cu2+-doped CsPbCl3 QDs were increased to 51%, showing great photostability. From the results, it is believed that Cu:CsPbCl3 QDs can be widely used in optoelectronic devices.
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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DOI
PubMed
高影响因子
ADVANCED MATERIALS
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2025
·
IF 26.8
Yingtong Zhou,Yulu Hua,Shuo Li,Jiaqi Zhang,Haibo Wang,Wenxu Yin,Xiaoyu Zhang,Weitao Zheng,Andrey L. Rogach
Achieving efficient and stable blue-emitting quasi-two-dimensional (quasi-2D) perovskite light-emitting diodes (LEDs) remains a challenge due to the poor solubility of conventional chloride precursors and the difficulty to form thick, uniform films with a well-controlled phase distribution. A new strategy is proposed to address this challenge using CsPbCl 3 quantum dots (QDs) capped with oleylamine (OLA) ligands as an alternative chlorine source. It is demonstrated how the use of these QDs enables formation of quasi-2D perovskite films with vertically aligned crystalline structure, thickness over 100 nm, and improved stability. OLA ligands regulate the crystal phase distribution and grain boundaries, suppressing the appearance of small- n 2D phases and reducing the number of crystal defects, while inorganic CsPbCl 3 QD cores induce vertical crystallization of quasi-2D perovskite films, endowing them with enhanced structural stability. The use of this non-conventional chlorine source is proven instrumental in improving external quantum efficiency of quasi-2D perovskite sky-blue LEDs, reaching 26.2% at 485 nm, with significantly enhanced electroluminescence stability both in terms of peak position and brightness. This study demonstrates a novel methodology using CsPbCl 3 QDs capped with conventional organic ligands to achieve thick quasi-2D perovskite layers for blue LEDs, addressing existing limitations in perovskite optoelectronics.
研究领域:
材料科学
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纳米技术
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光电子学
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半导体器件
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薄膜技术
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2018
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IF 8.097
Weiwei Chen,Tongchao Shi,Juan Du,Zhigang Zang,Zhiqiang Yao,Meng Li,Kuan Sun,Wei Hu,Yuxin Leng,Xiaosheng Tang
As an outstanding less-Pb candidate, doping Mn2+ ions into perovskite quantum dots (QDs) has received significant interest in the application of light-emitting diodes (LEDs). However, their further applications are impeded by poor chemical instability. Here, the silica-wrapped Mn-doped CsPbCl3 QDs are fabricated via hydrolyzing (3-aminopropyl) triethoxysilane with improved operational stability. Also, the photoluminescence quantum yield as high as 55.4% for the CsPbMnCl3@SiO2 composite is achieved. Silica wrapping can protect the perovskite QDs from damage by temperature and humidity as well as anion exchange. Furthermore, white LED devices are prepared by employing the mixture of green CsPbBr3 QDs and orange-red CsPbMnCl3@SiO2 composites. The as-obtained white LED device operated at a forward current of 20 mA exhibits bright natural light with a high luminous efficiency of 77.59 lm/W, and the corresponding color rendering index of 82 and color temperature (CCT) of 3950 K are obtained. Additionally, the electroluminescence spectrum shows nearly no variation after 24 h operation. This work will promote the Mn-doped CsPbCl3 QDs material to the practical application in solid-state LEDs.
研究领域:
材料科学
·
纳米技术
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光电技术
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光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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