Abstract
Organic–inorganic CH3NH3PbCl3 perovskite nanocrystals (PNCs) doped with Mn2+, CH3NH3PbxMn1−xCl3, have been successfully prepared using a reprecipitation method at room temperature. Structural and morphological characterizations reveal that the CH3NH3PbxMn1−xCl3 PNCs with cubic phase transforms from particles to cubes and increases in size from 16.2 ± 4.4 nm in average diameter to 25.3 ± 7.2 nm in cubic length after the addition of Mn2+ precursor. The CH3NH3PbxMn1−xCl3 PNCs exhibit a weak exciton emission at ~405 nm with a low absolute quantum yield (QY) of around 0.4%, but a strong Mn2+ dopant emission at ~610 nm with a high QY of around 15.2%, resulting from efficient energy transfer from the PNC host to the Mn2+ dopant via the 4T1→6A1 transition. In addition, the thermal and air stability of CH3NH3PbxMn1−xCl3 PNCs are improved due to the passivation with (3-aminopropyl) triethoxysilane (APTES), which is important for applications such as light emitting diodes (LEDs).
Highlights
Mn2+ -doped all inorganic CsPbCl3 perovskite nanocrystals (PNCs) have attracted increasing attention owing to the appropriate band alignment of CsPbCl3 and d-d transition of Mn2+ (2.15 eV, 6 A1 →4 T1 ), resulting in efficient intraparticle energy transfer between the host exciton and dopant ions [25,31]
We demonstrate that Mn2+ can be doped into CH3 NH3 PbCl3 PNCs via a reprecipitation method
Mn2+-doped CH3NH3PbCl3 PNCs feature a broad emission band peaked at 610 nm, attributed to the wavelength owing to a significant increase in average particle size
Summary
As a promising candidate for photovoltaics and lighting application, lead halide perovskite (LHP) afford many intriguing advantages over traditional semiconductor materials such as simple fabrication [1,2,3,4], abundant precursors source, defect tolerance [5,6], high photoluminescence (PL). Several heterovalent or isovalent metal ions such as Bi3+ [21], Al3+ [22], Sn2+ [23], Cd2+ [23], Zn2+ [23], and Mn2+ [24,25,26,27,28,29,30] have been introduced into LHP as dopants to modulate their optical properties Among these metal ions, Mn2+ -doped all inorganic CsPbCl3 perovskite nanocrystals (PNCs) have attracted increasing attention owing to the appropriate band alignment of CsPbCl3 and d-d transition of Mn2+ (2.15 eV, 6 A1 →4 T1 ), resulting in efficient intraparticle energy transfer between the host exciton and dopant ions [25,31]. The SiO2 shell resulting from the hydrolysis of APTES capping ligand can greatly improve the product yield and stability of CH3 NH3 PbCl3 PNCs towards water and air [34].
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