Peigeng Han

State Key Laboratory of Molecular Reaction Dynamics

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Keli Han

University of Chinese Academy of Sciences

Ruiling Zhang

Shandong University

Junsheng Chen

Shaanxi University of Science and Technology

Bin Yang

University of California, San Diego

Cheng Li

Xiamen University of Technology

Songqiu Yang

University of South China

Cheng Luo

Dalian Institute of Chemical Physics

Qiujie Wang

China Three Gorges University

Wei Zhou

Xi’an Jiaotong-Liverpool University

Sujun Ji

Shandong University

Cooperative Institutions

Chinese Academy of Sciences

Shandong University

Dalian Institute of Chemical Physics

University of Chinese Academy of Sciences

State Key Laboratory of Molecular Reaction Dynamics

Nanjing University of Science and Technology

Dalian University

Huazhong University of Science and Technology

Dalian University of Technology

Shanghai Jiao Tong University

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Lanthanide/Bismuth-Codoped Lead-Free Halide Double Perovskite Nanocrystals with Upconversion and Short-Wave Infrared Luminescence

The Journal of Physical Chemistry C (2023)

Cheng Li Peigeng Han Wei Zhou Xiaochen Wang Zhiling Ding

Lead-free halide double perovskite (DP) nanocrystals (NCs) have been regarded as a class of environmentally friendly and promising optoelectronic nanomaterials. Herein, we report the synthesis and luminescence properties of all-inorganic lanthanide/bismuth (Ln3+/Bi3+)-codoped Cs2NaInCl6 DP NCs. Yb/Er-codoped Cs2NaInCl6 NCs show upconversion (UC) and downshifting short-wave infrared (SWIR) photoluminescence (PL). By further introducing Bi3+ ions into the host, both UC and SWIR PL can be significantly enhanced, which are 2 orders of magnitude higher than those of Bi-free DP NCs. This is mainly due to the excellent synergy between the lanthanide and bismuth dopants and the high compatibility of these dopants with the Cs2NaInCl6 host. This work will help to guide the design and development of novel highly efficient luminescent nanomaterials.

Bismuth

Photon Upconversion

Nanomaterials

10.1021/acs.jpcc.3c05951

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Citations (2)

Tb3+ and Bi3+ Co-Doping of Lead-Free Cs2NaInCl6 Double Perovskite Nanocrystals for Tailoring Optical Properties

Nanomaterials (2023)

Yang Yu Wei Zhou Cheng Li Peigeng Han Hui Li

Lead halide perovskites have achieved remarkable success in various photovoltaic and optoelectronic applications, especially solar cells and light-emitting diodes (LEDs). Despite the significant advances of lead halide perovskites, lead toxicity and insufficient stability limit their commercialization. Lead-free double perovskites (DPs) are potential materials to address these issues because of their non-toxicity and high stability. By doping DP nanocrystals (NCs) with lanthanide ions (Ln3+), it is possible to make them more stable and impart their optical properties. In this work, a variable temperature hot injection method is used to synthesize lead-free Tb3+-doped Cs2NaInCl6 DP NCs, which exhibit a major narrow green photoluminescence (PL) peak at 544 nm derived from the transition of Tb3+ 5D4→7F5. With further Bi3+ co-doping, the Tb3+-Bi3+-co-doped Cs2NaInCl6 DP NCs are not only directly excited at 280 nm but are also excited at 310 nm and 342 nm. The latter have a higher PL intensity because partial Tb3+ ions are excited through more efficient energy transfer channels from the Bi3+ to the Tb3+ ions. The investigation of the underlying mechanism between the intrinsic emission of Cs2NaInCl6 NCs and the narrow green PL caused by lanthanide ion doping in this paper will facilitate the development of lead-free halide perovskite NCs.

10.3390/nano13030549

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Citations (13)

Size effect of lead-free halide double perovskite on luminescence property

Science China Chemistry (2019)

Peigeng Han Xue Zhang Xin Mao Bin Yang Songqiu Yang

10.1007/s11426-019-9520-1

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Citations (110)

Cation engineering in low-dimensional organic-inorganic copper halides for high color rendering index WLEDs

Chemical Engineering Journal (2023)

Hong Yin Wenzhi Li Zhongyi Wang Pengyuan Wang Xin Xu

Color rendering index

10.1016/j.cej.2023.144353

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Quantitative Decoupling of Strong Mn─Mn Coupling on Photoluminescence of Zero‐Dimensional Hybrid Manganese Chlorides Single Crystals

Advanced Optical Materials (2024)

Cheng Luo Juntao Li Ruiling Zhang Peigeng Han Jianyong Liu

Abstract Strong Mn─Mn coupling interactions, including dipolar and exchange interactions, significantly affect the photoluminescence quantum yields (PLQYs) in Mn 2+ ‐based luminescent materials. However, clarifying the individual effects of dipole–dipole and exchange interactions on photoluminescence (PL) is challenging because these interactions may have similar effects on PL properties, and there is a lack of materials with precisely tunable Mn─Mn distances over a wide range. In this study, the influence of dipolar and exchange coupling on PLQY is quantitatively decoupled by designing a series of hybrid manganese chlorides single crystals with a wide tuning range of Mn─Mn distances, from 6.0 to 9.5 Å. It is found that the PLQY can be enhanced from 2.1% to 57.1%, and the PL lifetime increased from 0.21 to 3.81 ms as the Mn─Mn distance increased. This enhancement is solely attributed to the decreased energy transfer dominated by dipole–dipole interactions. At the shortest Mn─Mn distance of 6 Å, exchange coupling becomes dominant, resulting in an additional red‐side PL band with negligible effects on PLQY and lifetime. This work provides valuable insights into the mechanisms underlying the regulation of PLQY in Mn 2 ⁺‐based luminescent materials.

Decoupling (probability)

Zero (linguistics)

10.1002/adom.202401591

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Unveiling the Localized Exciton-Based Photoluminescence of Manganese Doped Cesium Zinc Halide Nanocrystals

Nano Letters (2023)

Jie Hou Runze Liu Peigeng Han Cheng Luo Zhiling Ding

Lead-free metal halide nanocrystals (NCs) have aroused increasing attention due to their unique optoelectronic properties based on localized excitons (LEs). However, the vital influencing factors for the LEs based photoluminescence (PL) are still not well-understood due to the coupling of various intrinsic and extrinsic factors of the NCs. Herein, by engineering the phase, size, morphology, and chemical composition, we are able to decouple the intrinsic and extrinsic factors of manganese doped cesium zinc-halide NCs. We found both the intrinsic metal-halide coordination field and the extrinsic crystal defects have significant influences on the LEs' recombination and energy transfer processes, and hence determine the PL efficiency. Unlike for the free excitons (FEs) based PL, the phase as well as the crystal morphology do not play major roles for the LEs based PL. This work provides a new insight for the study of LE dynamics of metal halide NCs.

Metal halides

Caesium

Crystal (programming language)

10.1021/acs.nanolett.2c05101

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Citations (14)

CCDC 2213695: Experimental Crystal Structure Determination

The Cambridge Structural Database (2022)

Tianxin Bai Xiaochen Wang Zhongyi Wang Sujun Ji Xuan Meng

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccdc.csd.cc2d9jjs

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Citations (0)

CCDC 2213693: Experimental Crystal Structure Determination

The Cambridge Structural Database (2022)

Tianxin Bai Xiaochen Wang Zhongyi Wang Sujun Ji Xuan Meng

10.5517/ccdc.csd.cc2d9jgq

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Manganese-Doped, Lead-Free Double Perovskite Nanocrystals for Bright Orange-Red Emission

ACS Central Science (2020)

Peigeng Han Xue Zhang Cheng Luo Wei Zhou Songqiu Yang

Lead-free halide perovskite nanocrystals (NCs) have recently attracted attention due to their nontoxicity and stability as alternatives to lead-based perovskite NCs. Here, we report undoped and manganese-doped all-inorganic, lead-free double perovskite (DP) NCs: Cs2NaIn x Bi1-x Cl6 (0 < x < 1) and Cs2NaIn x Bi1-x Cl6:Mn (0 ≤ x ≤ 1) NCs. Undoped NCs exhibit blue emission. Through doping Mn2+ ions into Cs2NaIn x Bi1-x Cl6 NCs, we can avoid self-trapped exciton emission and realize bright orange red emission of Mn2+ dopants with the highest photoluminescence quantum efficiency of 44.6%. The photoluminescence (PL) is tunable from yellow emission to orange-red emission corresponding to a red shift from 583 to 614 nm with increasing In content. Interestingly, the PL emission of Mn-doped NCs shows a red shift from the bulk size to the nanoscale. The Mn-doped NCs show good stability in air. In addition, we further prove the process of dark self-trapped state-assisted Mn2+ emission in DP NCs by ultrafast transient absorption techniques.

10.1021/acscentsci.0c00056

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Citations (122)

CCDC 2213696: Experimental Crystal Structure Determination

The Cambridge Structural Database (2022)

Tianxin Bai Xiaochen Wang Zhongyi Wang Sujun Ji Xuan Meng

10.5517/ccdc.csd.cc2d9jkt

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Citations (0)