Samarium-Doped Metal Halide Perovskite Nanocrystals for Single-Component Electroluminescent White Light-Emitting Diodes

Abstract

Photoluminescence (PL) of rare earth (RE) ions has been observed in RE ion-doped perovskite nanocrystals (PeNCs); however, the electroluminescence (EL) originating from the RE ions is still not achieved in perovskite light-emitting diodes (PeLEDs). Herein, we demonstrate the first observation of EL from the PeLEDs based on Sm3+-doped CsPbCl3 PeNCs, which is realized by benefiting from the as-prepared Sm3+-doped CsPbCl3 PeNCs with photoluminescence quantum yield (PLQY) as high as 85% synthesized through a modified hot-injection method. The color of the EL can be modulated from the blue to the orange spectral region by varying the Sm3+ ion doping concentration. Therefore, the single-component white light-emitting PeLEDs with chromaticity coordinate (CIE) of (0.32, 0.31), a maximum luminance of 938 cd/m2, EQE of 1.2%, and color rendering index (CRI) of 93 are realized, which are desirable results for practical application. This work demonstrates the unique application of RE-doped PeNCs and provides a strategy for devices using white light PeLEDs.

Switching on near-infrared light in lanthanide-doped CsPbCl3 perovskite nanocrystals

“…It has been shown that introducing intermediate states in the mid bandgap of the host by metal ions doping, particularly for Yb 3+ with emission at ∼1.0 μm, is an effective strategy to tune the emission of LHP hosts to the near-infrared (NIR) region. [14][15][16][17][18][19][20][21] Nonetheless, the upper limit of the emission wavelength still remains below 1.0 μm, which greatly restricts the particularly interesting applications of these materials in optoelectronic and photonic devices working in the NIR such as telecommunication, light-emitting diodes, and lasers. [22][23][24] Unlike Yb 3+ -doped CsPbCl 3 , [17][18][19]25 which exhibits an extremely intense Yb 3+ NIR emission at ∼1.0 μm through a quantumcutting effect first reported by Song's group, 17,18 other NIR luminescent lanthanide ions (Ln 3+ ), such as Er 3+ , Nd 3+ and Ho 3+ unexpectedly show negligible emission.…”

Switching on Near-Infrared Light in Lanthanide-doped CsPbCl3 Perovskite Nanocrystals.pdf

“…It has been shown that introducing intermediate states in the mid bandgap of the host by metal ions doping, particularly for Yb 3+ with emission at ~1.0 μm, is an effective strategy to tune the emission of LHP hosts to the near-infrared (NIR) region. [14][15][16][17][18][19][20][21] Nonetheless, the upper limit of the emission wavelength still remains below 1.0 μm, which greatly restricts the particularly interesting applications of these materials in optoelectronic and photonic devices working in the NIR such as telecommunication, light-emitting diodes, and lasers. [22][23][24] Unlike Yb 3+ -doped CsPbCl3, which exhibits an extremely intense Yb 3+ NIR emission at ~1.0 μm through a quantumcutting effect, [17,19,25] other NIR luminescent lanthanide ions (Ln 3+ ), such as Er 3+ , Nd 3+ and Ho 3+ unexpectedly show negligible emission.…”

Color Tuning for Perovskite Light-Emitting Diodes

“…For instance, by blending blue CsPbBrxCl3-x QDs with orange polymer of poly[2-methoxy-5-(2-ethylhexyloxy)1,4-phenylenevinylene] (MEH:PPV) with the ratio of 9 : 1, a single-EML white LED with CIE chromaticity coordinates of (0.33, 0.34) was demonstrated ( Figure 5.3). [179] Other additional emitters, like rare-earth ion Sm 3+ , [180] alkali metal Mg 2+ , [181] also show good compatibilities with perovskites. Adapted from reference.…”