Flexible Large‐Area Light‐Emitting Devices Based on WS₂ Monolayers

Abstract

Using mechanically flexible substrates for complex (opto-)electronic device architectures is of growing interest in the area of consumer electronics, [1] for wearables [2] or for applications in biology and life science. [3] Potential candidates for light-emitting devices (LEDs) on curved or flexible surfaces are organic LEDs (OLEDs) [4] or quantum dot LEDs [5,6] (QD-LEDs). Higher durability is achieved by bottom-up approaches, which combine individual inorganic micro-LEDs to flexible arrays. [1,3] Although two-dimensional (2D) materials are ideally suited for flexible device applications, [7-9] only a few flexible prototype devices such as transistors [10-12] or photodetectors [13-15] have

Strain Engineering in 2D Material‐Based Flexible Optoelectronics

“…l) Reproduced with permission. [ 121 ] Copyright 2020, Wiley‐VCH GmbH. m) Reproduced with permission.…”

“…Dominik et al. [ 121 ] built a mechanically flexible and scalable LED based on WS 2 monolayer grown by the metal organic chemical vapor deposition method, as shown in Figure 11l. The indium tin oxide (ITO) coated PEN foil is used as a bendable substrate and acted as the transparent anode.…”

Enhanced Photoluminescence of Monolayer MoSe2 in a Double Resonant Plasmonic Nanocavity with Fano Resonance and Mode Matching

“…[ 2 ] In addition, the broken inversion symmetry and strong spin−orbit coupling in monolayer TMDs result in the fascinating valley‐ and spin‐dependent optical and electrical properties. [ 3 ] These unique features hold a great promise for exploring novel optoelectronic applications such as photodetectors, [ 4 ] solar cells, [ 5 ] light‐emitting devices,(LEDs) [ 6 ] and nanolasers. [ 7 ] However, inherited from the atomically thin nature, the weak absorption and low photoluminescence (PL) quantum yield become fundamental obstacles to high‐performance TMD‐based devices.…”

Large-Area Organic–Transition Metal Dichalcogenide Hybrid Light-Emitting Device

“…Monolayer transition metal dichalcogenides (TMDCs), a subclass of 2D layered materials, have promising optical characteristics such as efficient photoluminescence (PL), , fast exciton decay, and high chemical and air stability . As a result, TMDCs have been used in various optoelectronic devices, showing distinct characteristics from conventional bulk semiconductors. − For example, light-emitting devices (LEDs) based on hexagonal boron nitride (h-BN) insulators combined with TMDCs as the active luminescent materials have been demonstrated. − , However, the LEDs require a sequence of complex layer transfers during the fabrication and are constrained by the limited size of the 2D semiconductor flakes (several μm). , Recently, a large-area TMDC-based LED has been demonstrated, although its external quantum efficiency was low (∼10 –4 %) compared to LEDs based on exfoliated TMDCs. , …”