Continuous‐Wave Lasing in Perovskite LEDs with an Integrated Distributed Feedback Resonator

Abstract

Realization of electrically pumped laser diodes based on solution‐processed semiconductors is a long‐standing challenge. Metal halide perovskites have shown great potential toward this goal due to the excellent optoelectronic properties. Continuous‐wave (CW) optically pumped lasing in a real electroluminescent device represents a key step to the current injection laser diode, but it has not been realized yet. This is mainly due to the challenge of incorporating a resonant cavity into an efficient light‐emitting diode (LED) which can sustain intensive carrier injection. Here we report CW lasing in an efficient perovskite LED with an integrated distributed feedback resonator, which shows a low lasing threshold of 220 W·cm−2 at 110 K. Importantly, the LED works well at a current density of 330 A·cm−2, indicating the carrier injection rate already exceeds the threshold of optically‐pumping. Our results suggest that electrically pumped perovskite laser diodes can be achieved once the Joule heating issue is overcome.This article is protected by copyright. All rights reserved

Long-term air-stable amplified spontaneous emission in quasi-2D perovskite films through ligand engineering

“…These advantages, in combination with simple solution processing, 5 ensure lead halide perovskite acts as a promising coherent light source candidate. Low-threshold amplified spontaneous emission (ASE) and lasing have been achieved based on lead halide perovskite, 6–8 suggesting its great potential in laser gain media. However, perovskites suffer from instability especially when exposed to moisture and oxygen.…”

“…13,14 The natural quantum well structure permits the effective energy funneling from small- n to large- n domains, thus facilitating the population inversion and lowering the threshold of stimulated emission significantly. 15–17 In recent years, several groups have reported low threshold pulsed pumped lasing, 18–20 and even continuous wave optical pumped lasing 6,8,21 based on quasi-2D perovskite films. Thanks to hydrophobic long-chain ligands, quasi-2D perovskites exhibit better stability in ambient atmosphere.…”

Defects and self-trapped exciton regulation in rare-earth doped all-inorganic perovskites

“…1–5 They have been applied to fabricate a variety of novel light-emitting diodes, lasers, high-efficiency solar cells, and photodetectors. 6–9 Bandgap tuning is a fundamental and crucial pathway for achieving rich optoelectronic applications. Halogen ratio tuning in alloyed CsPbX 3 or quantum size effect control has been realized as a commonly used approach to achieving bandgap tuning and eventually enriching their optoelectronic applications.…”

Surface Ligand Engineering to Modulate the Synthesis of DJ-Type 2D Sn-Based Perovskites for Light-Emitting Diodes

“…Metal halide perovskites (MHPs) are widely embraced for their outstanding optoelectronic properties, finding applications in photovoltaics, 1,2 light-emitting diodes (LEDs), 3,4 photodetectors, 5 fluorescence imaging, 6 and photocatalysis data memories et al 7,8 However, the environmental concerns associated with Pb-based halide perovskites have underscored the need for research on Pb-free alternatives. 9−12 Among these, Sn-based halide perovskites have gained interest by reason for their similarities with Pb in various aspects.…”

“…Metal halide perovskites (MHPs) are widely embraced for their outstanding optoelectronic properties, finding applications in photovoltaics, , light-emitting diodes (LEDs), , photodetectors, fluorescence imaging, and photocatalysis data memories et al , However, the environmental concerns associated with Pb-based halide perovskites have underscored the need for research on Pb-free alternatives. − Among these, Sn-based halide perovskites have gained interest by reason for their similarities with Pb in various aspects. − Despite their promising features, MHPs face challenges in stability due to their inherent ionic structural properties, rendering them vulnerable to external factors like solvents, ultraviolet (UV) rays, temperature, humidity, and electric fields. This limitation significantly impacts the practical utilization of MHPs. , …”