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(a) Normalized photoluminescence spectra of RGB light from full-color micro-LEDs with perovskite quantum dot (PQD)/siloxane composite as color conversion layers (CCLs). (b) CIE color coordinates corresponding to the RGB light. The black and blue lines show the CIE color coordinates of the PQD micro-LED display and NTSC, respectively. Optical microscope images of (c–e) a partially enlarged individual pixel (scale bar: 200 µm) and (f) the whole pixels (scale bar: 500 µm) of the micro-LED with PQD/siloxane composite as CCLs. (g) Image of the full-color micro-LED with PQD/siloxane composite as CCLs under bending (scale bar: 5 mm).
Source publication
In this paper, we successfully fabricated color conversion layers (CCLs) for full-color-mico-LED display using a perovskite quantum dot (PQD)/siloxane composite by ligand exchanged PQD with silane composite followed by surface activation by an addition of halide-anion containing salt. Due to this surface activation, it was possible to construct the...
Citations
... As compared with the PQD films fabricated in the previous research, the PQD films fabricated in this study exhibited higher efficiency and stability [64,65]. In the previously reported QD films, the emission intensity decreased to 82% of the initial value after 1 month of storage under ambient conditions [66]. In addition, the polymethyl methacrylate films containing CsPbBr 3 QDs synthesized via the hot injection method retained 30% of the initial PL intensity after being exposed to 60°C and 90% RH for 100 h [67]. ...
In micro-/mini-light-emitting diode (Micro-/ Mini-LED) displays, optical crosstalk among chips is a critical issue. The precise optical crosstalk characterization of LED arrays is essential for designing high-contrast ratio optical crosstalk-free displays. In this study, we proposed a spectrum-based Monte Carlo ray tracing model to analyze the 3-D spatial optical crosstalk of the RGB mini-LED array. The model is based on the 2-D surface spectral distribution acquired by microscopic hyperspectral imaging (
$\mu $
-HSI) and validated by a spectral goniometer with a maximum deviation of less than 8.61%. Combining with a microintegrating sphere array (
$\mu $
-ISA), the 2-D optical crosstalk-free spectral distribution of the RGB Mini-LED array is imported to create the ray tracing model. In addition to the conventional light intensity distribution, color purity distribution and optical crosstalk at arbitrary spatial position can also be deduced. A pinhole-masked fiber spectrometer is used to verify the accuracy of the Monte Carlo ray tracing with a maximum deviation of less than 8.30%. The results indicate the great potential of spectrum-based Monte Carlo ray tracing in the designing of high-resolution microsized LED displays.
Inorganic CsPbX3 perovskite quantum dots (PeQDs) show great potential in white light‐emitting diodes (WLEDs) due to excellent optoelectronic properties, but their practical application is hampered by low photoluminescence quantum yield (PLQY) and especially poor stability. Herein, we developed an in‐situ and general multidentate ligand passivation strategy that allows for CsPbX3 PeQDs not only near‐unit PLQY, but significantly improved stability against storage, heat, and polar solvent. The enhanced optical property arises from high effectiveness of the multidentate ligand, diethylenetriaminepentaacetic acid (DTPA) with five carboxyl groups, in passivating uncoordinated Pb²⁺ defects and suppressing nonradiative recombination. First‐principles calculations reveal that the excellent stability is attributed to tridentate binding mode of DTPA that remarkably boosts the adsorption capacity to PeQD core. Finally, combining the green and red PeQDs with blue chip, we demonstrated highly luminous WLEDs with distinctly enhanced operation stability, a wide color gamut of 121.3% of national television system committee, standard white light of (0.33,0.33) in CIE 1931, and tunable color temperatures from warm to cold white light readily by emitters’ ratio. This study provides an operando yet general approach to achieve efficient and stable PeQDs for WLEDs and accelerates their progress to commercialization.
