Perovskite lasers
Perovskites are materials that share a crystal structure similar to the mineral called perovskite, which consists of calcium titanium oxide (CaTiO3).
Depending on which atoms/molecules are used in the structure, perovskites can possess an impressive array of interesting properties including superconductivity, ferroelectricity, charge ordering, spin dependent transport and much more. Perovskites therefore hold exciting opportunities for physicists, chemists and material scientists.
Lasers are devices that stimulate atoms or molecules to emit light at particular wavelengths and amplify that light, typically producing a very narrow beam of radiation. The emission usually focuses on an extremely limited range of visible, infrared, or ultraviolet wavelengths.Laser is an acronym for “light amplification by the stimulated emission of radiation”. Lasers are used in extremely diverse industries and applications, like optical disk drives, laser printers, barcode scanners, DNA sequencing instruments, fiber-optics, laser surgery and other medical applications, military and law enforcement devices and much more.
As direct bandgap semiconductors, perovskites exhibit the unique optical properties of bandgap tunability, charge-carrier mobility, defect tolerance, photoluminescence quantum efficiency and power conversion efficiency. These properties make them promising light-emitting materials for high optical gain, low-threshold and multicolor laser applications. The fact that they can be fabricated from low-cost precursors via simple processes makes them attractive as well.
Lower dimensionality perovskite materials, like nanoplatelets, dots, disks, wires etc., can be tailored to be highly desirable for controlled lasing because of their optical cavities and feedback architectures.
Despite their promising features, there are several challenges, for example low exciton binding energy, environmental stability, and formation of trap states at the vicinity of grain interfaces, that need to be addressed when considering perovskite use in lasers. In that respect, 2D perovskites and triple/mixed cation perovskites appear to have potential.
Phase-change perovskite enables traditional VCSEL to achieve low-threshold, tunable single-mode lasers
Researchers from China's Dalian University of Technology, University of Hong Kong and HKU-SIRI have achieved low-threshold, wide-wavelength tunable single-mode laser emission in the near-infrared (NIR) by combining phase-change perovskite with the traditional vertical-cavity surface-emitting laser (VCSEL) structure.
Schematic of a tunable microlaser based on phase-change perovskite gain medium, sandwiched between Au mirror and DBR reflector sitting on a quartz glass substrate, pumped by blue-violet laser (λ = 405 nm) and emitting a tunable beam in the near-IR from 790.7 nm to 799.5 nm. Image from: Opto-Electronic Advances
As an important light source, lasers are widely used in many fields such as communications, medical treatment, display technology and scientific research. However, the continuous advancement of technology means higher requirements from the performance of lasers, especially in terms of integration and tunability. Traditional lasers typically rely on fixed gain media and external microcavity structures (such as Fabry-Perot cavities, photonic crystals, whispering galleries, etc.). Although these structures can achieve efficient laser emission, their operating wavelengths are often fixed, which makes it difficult to meet the needs of modern science and technology for tunability. Therefore, the development of a laser that can achieve low-threshold laser emission and is tunable over a wide wavelength range has become one of the current research focuses.
Perovskite-Info launches a new edition of its Perovskite for Displays Market Report
Perovskite-Info is proud to announce an update to our Perovskite for the Display Industry Market Report. This market report, brought to you by the world's leading perovskite and OLED industry experts, is a comprehensive guide to next-generation perovskite-based solutions for the display industry that enable efficient, low cost and high-quality display devices. The report is now updated to February 2025, with all the latest commercial and research activities.
Reading this report, you'll learn all about:
- Perovskite materials and their properties
- Perovskite applications in the display industry
- Perovskite QDs for color conversion
- Prominent perovskite display related research activities
The report also provides a list of perovskite display companies, datasheets and brochures of pQD film solutions, an introduction to perovskite materials and processes, an introduction to emerging display technologies and more.
New ion doping strategy could improve the spintronic performance of perovskites and help achieve spin-polarized lasers
Spin-polarized lasers have been found superior to conventional lasers in many aspects of both performance and functionality. Hybrid organic-inorganic perovskites are emerging spintronic materials with great potential for advancing spin-polarized laser technology, but the rapid carrier spin relaxation process in hybrid perovskites presents a major bottleneck for spin-polarized lasing. Now, researchers at the Chinese Academy of Sciences (CAS) and Beijing Normal University have identified and successfully suppressed the spin relaxation mechanism in perovskites for the experimental realization of spin-polarized perovskite lasers.
The electron-hole exchange interaction was identified as the decisive spin relaxation mechanism hindering the realization of spin-polarized lasing in perovskite microcrystals. Consequently, an ion doping strategy was employed to introduce a new energy level in perovskites, which enables a long carrier spin lifetime by suppressing the electron-hole exchange interaction.
New method enables researchers to engineer layered perovskite materials at the atomic level
Researchers at North Carolina State University and Brookhaven National Laboratory have reported a technique for engineering layered hybrid perovskites (LHPs) down to the atomic level, which enables precise control on how the materials convert electrical charge into light.
Image credit: Matter
The technique opens the door to engineering materials tailored for use in next-generation printed LEDs, lasers and photovoltaic devices.
Researchers create unique perovskite nanowires with potential for laser applications
Researchers from China's Hunan University of Technology and Business, University of Macau and East China Normal University have developed a single-mode double-pulsed nanolaser utilizing self-assembled perovskite multiple quantum wells (MQWs).
The recent study presents a novel approach to achieving pulse-doubling in perovskite nanowire lasers. This research aims to enhance the understanding of laser dynamics and energy relaxation mechanisms in these advanced materials.
Perovskite-Info launches a new edition of its Perovskite for Displays Market Report
Perovskite-Info is proud to announce an update to our Perovskite for the Display Industry Market Report. This market report, brought to you by the world's leading perovskite and OLED industry experts, is a comprehensive guide to next-generation perovskite-based solutions for the display industry that enable efficient, low cost and high-quality display devices. The report is now updated to July 2024, with all the latest commercial and research activity - including 9 new research papers, new company, new brochures, and commercial updates and more!
Reading this report, you'll learn all about:
- Perovskite materials and their properties
- Perovskite applications in the display industry
- Perovskite QDs for color conversion
- Prominent perovskite display related research activities
The report also provides a list of perovskite display companies, datasheets and brochures of pQD film solutions, an introduction to perovskite materials and processes, an introduction to emerging display technologies and more.
Perovskite-Info launches a new edition of its Perovskite for Displays Market Report
Perovskite-Info is proud to announce an update to our Perovskite for the Display Industry Market Report. This market report, brought to you by the world's leading perovskite and OLED industry experts, is a comprehensive guide to next-generation perovskite-based solutions for the display industry that enable efficient, low cost and high-quality display devices. The report is now updated to February 2024, with all the latest commercial and research activity. This was a major version, with over 15 updates, new companies and new technologies covered.
Reading this report, you'll learn all about:
- Perovskite materials and their properties
- Perovskite applications in the display industry
- Perovskite QDs for color conversion
- Prominent perovskite display related research activities
The report also provides a list of perovskite display companies, datasheets and brochures of pQD film solutions, an introduction to perovskite materials and processes, an introduction to emerging display technologies and more.
Researchers boost signal amplification in perovskite nanosheets
Researchers at Pusan National University and the University of Oxford have made an advanced in the field of perovskite nanosheets as promising new laser materials. The team overcame the inherent limitations of CsPbBr quantum dots using perovskite nanosheets, which provide enhanced light amplification abilities.
The researchers introduced an innovative waveguide pattern, which increased the gain and thermal stability of the perovskite nanosheets. This pattern improved the optical confinement and heat dissipation, offering a solution to the limitations previously faced with quantum dots. The research team also pioneered a new ‘gain analysis’ method known as the ‘gain contour’. This novel technique provides a more in-depth understanding of gain saturation across various spectrum energies and optical stripe lengths.
Researchers report electrically assisted amplified spontaneous emission in perovskite LEDs
Researchers at Imec have reported a metal halide perovskite LED (PeLED) stack that emits 1,000x more light “than state-of-the-art OLEDs”. The team developed a transparent PeLED architecture, that combines low optical losses with excellent current-injection properties.
In this work, the team showed that perovskite semiconductor optical amplifiers and injection lasers are within reach using this type of transparent PeLED.
Researchers report perovskite nanowires-based graphene plasmonic waveguides with low loss and low gain threshold
Researchers at China's Huanghe Science and Technology University, Zhengzhou Normal University and Zhongke Weike Technology (Henan) Co., Ltd have designed a perovskite nanowire-based graphene plasmonic waveguide, where the perovskite nanowire is located on the graphene-insulator-metal (GIM) platform. The findings of this work could have potential applications in plasmonic waveguide-based devices, such as lasers, modulators, sensors, etc.
The finite element method was used in order to investigate the impact of the perovskite nanowire radius, graphene layer thickness, Fermi energy level of the graphene, thickness of the low index dielectric layer, and permittivity of dielectric layer on the mode properties. The results indicate that the hybrid mode exhibits very low propagating loss and ultra-high figure of merit.
