Memories in the Photoluminescence Intermittency of Single Cesium Lead Bromide Nanocrystals

Long-Range Exciton Diffusion in Two-Dimensional Assemblies of Cesium Lead Bromide Perovskite Nanocrystals

Förster Resonant Energy Transfer (FRET)-mediated exciton diffusion through artificial nanoscale building block assemblies could be used as a new optoelectronic design element to transport energy. However, so far nanocrystal (NC) systems supported only diffusion length of 30 nm, which are too small to be useful in devices. Here, we demonstrate a FRET-mediated exciton diffusion length of 200 nm with 0.5 cm2/s diffusivity through an ordered, two-dimensional assembly of cesium lead bromide perovskite nanocrystals (PNC). Exciton diffusion was directly measured via steady-state and time-resolved pho…

High-Efficiency Light-Emitting Diodes based on Formamidinium lead bromide nanocrystals and solution processed transport layers

Perovskite nanocrystal light-emitting diodes (LEDs) employing architecture comprising a ZnO nanoparticles electron-transport layer and a conjugated polymer hole-transport layer have been fabricated. The obtained LEDs demonstrate a maximum external-quantum-efficiency of 6.04%, luminance of 12998 Cd/m2 and stable electroluminescence at 519 nm. Importantly, such high efficiency and brightness have been achieved by employing solution processed transport layers, formamidinium lead bromide nanocrystals (CH(NH2)2PbBr3 NCs) synthesized at room-temperature and in air without the use of a Schlenk line, …

来自溴化铯铅的超带隙电致发光

Super-Bandgap Electroluminescence from Cesium Lead Bromide

本研究发现通过CsPbBr3与PEDOT:PSS界面形成纳米晶体的量子限域效应，可实现峰值能量高出带隙0.7 eV的超带隙电致发光，为稳定钙钛矿LED蓝光发射提供了新策略。

Optically Cooling Cesium Lead Tribromide Nanoparticles

One photon up-conversion photoluminescence is an optical phenomenon whereby the thermal energy of a fluorescent material increases the energy of an emitted photon compared with the energy of the photon that was absorbed. When this occurs with near unity efficiency, the emitting material undergoes a net decrease in temperature--so called optical cooling. Because the up-conversion mechanism is thermally activated, the yield of up-converted photoluminescence is also a reporter of the temperature of the emitter. Taking advantage of this optical signature, cesium lead trihalide nanocrystals are sho…

优化CsPbBr3纳米晶LED中的载流子平衡：烷基配体和极性电子传输层的作用

Optimizing carrier balance in CsPbBr3 nanocrystal LEDs: The role of alkyl ligands and polar electron transport layers

本文研究了不同配体对CsPbBr3纳米晶LED载流子平衡的影响，发现DDABr配体交换可改善空穴注入，结合极性电子传输层（ETL）的自发取向极化（SOP）效应，可将LED性能提升一个数量级以上。

The intrinsic (trap-free) transistors based on perovskite single crystals with self-passivated surfaces

Lead-halide perovskites emerged as novel semiconducting materials suitable for a variety of optoelectronic applications. However, fabrication of reliable perovskite field-effect transistors (FETs), the devices necessary for the fundamental and applied research on charge transport properties of this class of materials, has proven challenging. Here we demonstrate high-performance perovskite FETs based on epitaxial, single crystalline thin films of cesium lead bromide (CsPbBr3). An improved vapor-phase epitaxy has allowed growing truly large-area, atomically flat films of this perovskite with exc…