Yinhua Wang,Songchao Bai,Jie Sun,Hao Liang,Chao Li,Tianya Tan,Gang Yang,Jiwei Wang
Near-infrared (NIR) luminescent materials have been widely used in biomedicine, optical communication and other fields due to their unique photophysical properties. However, the development of efficient NIR luminescent materials is still a challenge. Herein, Sb 3+ , Tm 3+ co-doped Cs 2 NaYCl 6 double perovskite single crystals (SCs) have been synthesized. Benefiting from the crystal structure and rare earth lattice of rare earth-based double perovskite host, lanthanide ions can be doped effectively, and the optimal NIR photoluminescence quantum yield (PLQY) of Cs 2 NaYCl 6 :Sb 3+ , Tm 3+ SCs is up to 20.2%. The energy transfer mechanism was systematically surveyed by steady-state spectroscopy. Furthermore, a compact visible and NIR light emitting diode was fabricated by coating Cs 2 NaYCl 6 :Sb 3+ , Tm 3+ SCs on a commercial 320 nm LED chip. This light source has a promising application prospect in multifunctional lighting.
Jie Wu,Fangping Lin,Shuai Zhang,Haiyan Wang,Jiandong Yao,Xiaodong Shen,Nengneng Luo,Dan Huang,Ruosheng Zeng
Lead-free halide double perovskites (DPs) have attracted extensive attention due to their excellent optoelectronic properties, but the synthesis of one-dimensional (1D) organic–inorganic hybrid halide DPs with high photoluminescence quantum yield (PLQY) is still challenging to date. Herein, we successfully prepared high-quality 1D hybrid (TMA)2NaInCl6 (TMA is tetramethylammonium) DPs by two synthetic routes and near-unity PLQY was achieved by incorporating Sb3+ ions into (TMA)2NaInCl6, which is much higher than that of 3D all-inorganic DPs. Temperature-dependent PL spectroscopic characterizations indicated that strong electron–phonon coupling existed in the excited state in doped system. Density functional theory calculations revealed that the incorporation of Sb3+ ions modulated the distribution of density of states and 24-fold enhancing in transition probability thereby significantly improved the PLQY. Our study presented new physical insights for in-depth understanding photophysical mechanisms and should be very important for regulating the optical performance of perovskite materials.
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