Narrow‐Band Green‐Emitting Hybrid Organic–Inorganic Eu (II)‐Iodides for Next‐Generation Micro‐LED Displays

Abstract

Low‐dimensional metal halide perovskites are an emerging class of light‐emitting materials for LED‐based displays; however, their B‐site cations are confined to ns2, d5, and d10 metals. Here, we present the design of rare earth ions at B‐site and report a novel Eu(II)‐based iodide hybrid with efficient (PLQY ∼ 98%) narrow‐band (FWHM ∼ 43 nm) green emission and high thermal stability (97%@150 °C). Owing to reduced lattice vibrations and shrunken average distance of Eu(II)‐iodide bonds in the face‐sharing 1D‐structure, photoluminescence from Eu(II) 4f‐5d transition appears along with elevated crystal‐field splitting of 5d energy level. We further demonstrate the Eu(II)‐based iodide hybrid for color‐pure green pc‐LEDs with a maximum brightness of approximately 396,000 cd m−2 and photoelectric efficiency of 29.2%. We also present high‐resolution micro‐LED displays (2540 PPI) via the solution‐processed screen. This work thus showcases a compelling narrow‐band green emitter for commercial micro‐LED displays.This article is protected by copyright. All rights reserved

Mn(II)-Based Metal Halide with Near-Unity Quantum Yield for White LEDs and High-Resolution X-ray Imaging

“…As shown in Figure d, the RL intensity of (4-BTP) 2 MnBr 4 was measured under various X-rays at air conditions, with a perfect linear response (Figure e) from 17.4 to 270 μGy/s and a low detection limit of 37.4 nGy/s. Obviously, the excellent performance is superior to that of these reported commercial LYSO:Ce scintillator (60.1 nGy/s) and significantly less than the limitation of X-ray medical diagnostic (5.5 μGy/s). , In addition, we measured the stability of (4-BTP) 2 MnBr 4 under continuous 50 keV X-ray irradiation after 40 on/off cycles, and no reduced significant attenuation of the RL intensity of (4-BTP) 2 MnBr 4 was observed, revealing its decent radiation stability for scintillation applications (Figure f) …”

Non-equivalent Mn4+ doping in mixed-anion host of K3Na(MoO2F4)2·H2O achieving short fluorescence lifetime and intense zero phonon line

“…Narrow band emitters activated with Eu 2+ and Mn 4+ , show advantages in the backlight to achieve a wide color gamut. [1][2][3] Mn 4+ , when doped in a fluoride host, tends to show narrow-band emission peaking at 631 nm with a full-width at half-maximum (FWHM) of less than 30 nm. These emissions are at the relatively high sensitive region of the human eye and remain unfiltered by the red color filter of LCD modules.…”

Cryogenic Narrowband Green Emission in Blue-Light Excited Pb-Free Double Perovskite Cs2Ag0.6Na0.4In0.8Bi0.2Cl6@KSCN via Surface Reconstruction-Induced Energy Level Modification

“…With the rapid progress of technology, modern display technologies, including micro-LEDs, OLEDs, and quantum dots, have surpassed traditional constraints, delivering immersive experiences characterized by remarkable brightness, contrast, and resolution. , Notably, narrowband emission plays a pivotal role in significantly enhancing color reproducibility, resulting in displays that are not only more accurate but also more vivid, thereby elevating the overall visual experience. , However, no Pb-free double perovskite alternatives have been developed for achieving blue light excitation with narrowband green light emission thus far.…”