Journal of Energy Chemistry ›› 2022, Vol. 65 ›› Issue (2): 600-604.DOI: 10.1016/j.jechem.2021.06.033

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Doped all-inorganic cesium zirconium halide perovskites with high-efficiency and tunable emission

Pengfei Chenga, Daoyuan Zhengb, Lu Fengc, Yuefeng Liuc, Junxue Liua, Juntao Lid,e, Yang Yanga, Guoxiong Wangc, Keli Hana,b,e,*   

  1. aState Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, Liaoning, China;
    bInstitute of Molecular Sciences and Engineering, Shandong University, Qingdao 266000, Shandong, China;
    cDalian National Laboratory for Clean Energy (DNL), Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, Liaoning, China;
    dKey Laboratory of Chemical Lasers, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, Liaoning, China;
    eUniversity of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2021-05-16 Revised:2021-06-19 Accepted:2021-06-24 Online:2022-02-15 Published:2022-10-26
  • Contact: *E-mail address: klhan@dicp.ac.cn (K. Han).

Abstract: Doping enables manipulation of both the electrical and optical properties of halide perovskites. Herein, we incorporated Te4+ into Cs2ZrCl6 single crystal, simultaneously preserving the vacancy-ordered structure, to obtain an efficient yellow-emitting perovskite with a near-unity photoluminescence quantum yield (PLQY ≈ 97.6%). Te4+ doping modifies the hue and emission color of pristine Cs2ZrCl6, generates new absorption channels, and successfully extends the excitation energy from < 280 nm to 360-450 nm range. Detailed spectral characterizations, including ultrafast femtosecond transient absorption measurements, reveal that the bright yellow light is derived from triplet self-trapped excitons. Moreover, further tuning doping concentration enables Te-doped Cs2ZrCl6 single crystals to exhibit efficient warm white light emission. This work provides a new perspective for the development and design of stable lead-free perovskites with highly efficient luminescence.

Key words: Zirconium halide perovskite, Doping, Excitation energy, Photoluminescence, Energy transfer