Lasers photovoltaics and thermoelectrically-pumped light emitting diodes

We consider an InGaAs/GaAs quantum-dot, driven by an ultrafast laser pulse with a time-dependent amplitude and frequency. As illustrated in Fig. 1a, we model the dot as a two-level system, consisting o.
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Perovskite Materials for Light-Emitting Diodes and Lasers

May 1, 2016· Organic-inorganic perovskites have become a focal point in research related to photovoltaics, light-emitting diodes, lasers, to create electrically pumped semiconductor lasers [62, 63]. Xing

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Numerical simulation of electrically pumped active vertical‐cavity

3 days ago· Solution-processed metal halide perovskite (MHP) materials have been rapidly progressed in photovoltaic devices and light-emitting diodes. 7 The corresponding device fabrication techniques have been fully developed, mainly based on low-carbon footprint approaches such as spin coating, 8, 9 doctor blading, 10 and ink printing. 11 Based on these

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Numerical simulation of electrically pumped active vertical‐cavity

3 days ago· Solution-processed metal halide perovskite (MHP) materials have been rapidly progressed in photovoltaic devices and light-emitting diodes. 7 The corresponding device

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Hybrid optoelectronics: A polymer laser pumped by a nitride light

Apr 23, 2008· We demonstrate indirect electrically pumped lasing in a hybrid polymer laser. The lasers comprise a corrugated fluorene copolymer waveguide on an InGaN light-emitting diode and were driven under nanosecond pulsed operation. We observe the onset of distributed feedback lasing at 568nm for peak drive currents above 144A. Angle-resolved photoluminescence

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Highly-efficient thermoelectric-driven light-emitting diodes based

Aug 26, 2022· Driven by sub-bandgap electric work and Peltier heat, thermoelectric-driven light-emitting diodes (TED-LEDs) not only offer much enhanced power-conversion-efficiency but also eliminate the waste heat generated during the operation of LEDs. However, cost-effective and high-efficiency TED-LEDs are not readily accessible for the epitaxially grown III-V LEDs due to

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Tracing the electron transport behavior in quantum-dot light-emitting

Sep 17, 2024· Quantum-dot (QD) light-emitting diodes (QLEDs) are hotly investigated due to their potential applications in low-cost, wide color gamut and flexible displays 1,2,3,4,5,6,7 the past decade

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Semiconductor laser monolithically pumped with a light emitting diode

Data are presented on a monolithic chip that integrates a quantum well semiconductor laser with a high efficiency light emitting diode (LED), with the LED used to optically pump the laser. The LED operates in the thermoelectrophotonic regime that can produce heat absorption, offering the possibility of heat pump action. The internal optical pumping also offers the possibility of very

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Carrier Dynamics in Quantum Dot Light‐Emitting Diodes: The

Oct 29, 2024· The dimension of the cores is typically smaller than or comparable to the Bohr radius of their corresponding excitons. [24-26] This restricts the movement of electrons and

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Light-emitting diode pumped polymer lasers

Aug 28, 2008· Semiconducting polymers are very promising optoelectronic materials enabling the simple fabrication of devices such as light-emitting diodes, lasers and solar cells. However, the development of polymer lasers has been hampered by the low charge mobility of these materials preventing electrically driven lasers. We find that this problem can be overcome by taking

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Bright and stable perovskite light-emitting diodes in the near

Mar 15, 2023· Perovskite light-emitting diodes (LEDs) have attracted broad attention due to their rapidly increasing external quantum efficiencies (EQEs) 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15.However, most high

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Electrical Pumping of Perovskite Diodes: Toward Stimulated

Jul 8, 2021· The success of metal halide perovskites in photovoltaic and light-emitting diodes (LEDs) motivates their application as a solid-state thin-film laser. Various perovskites have

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MIT Open Access Articles

Thermoelectrically Pumped Light-Emitting Diodes Operating above Unity Efficiency The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Citation: Santhanam, Parthiban, Dodd Gray, and Rajeev Ram. "Thermoelectrically Pumped Light-Emitting Diodes Operating Above Unity Efficiency."

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Exciton-phonon heat flow for laser-driven excitons. Predicted heat

Lasers, photovoltaics, and thermoelectrically-pumped light emitting diodes are thermodynamic machines which use excitons (electron-hole pairs) as the working medium.

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Metal halide perovskites for light-emitting diodes

Sep 14, 2020· Metal halide perovskites, which have led to great advances in photovoltaic devices, have also proved to be promising candidates for light-emitting diodes (LEDs) 1.They have shown excellent

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Light-emitting diode pumped luminescent concentrators: a new

May 20, 2016· High-power light-emitting diodes (LEDs) today are twice as powerful as four years ago while meantime their price has been divided by 4 making them promising sources for laser pumping. However, their irradiance still falls short by one order of magnitude of what is needed to efficiently pump solid-state lasers. We demonstrate that an LED-pumped Ce:YAG luminescent

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A quantum-dot heat engine operating close to the thermodynamic

Oct 2, 2017· Lasers, photovoltaics, and thermoelectrically-pumped light emitting diodes are thermodynamic machines which use excitons (electron-hole pairs) as the working medium.

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Thermoelectrically Pumped Light-Emitting Diodes Operating

Feb 27, 2012· A heated semiconductor light-emitting diode at low forward bias voltage V < k B T / q is shown to use electrical work to pump heat from the lattice to the photon field. Here the rates of both radiative and nonradiative recombination have contributions at linear order in V.As a result the device''s wall-plug (i.e., power conversion) efficiency is inversely proportional to its output

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[PDF] Electro-luminescent cooling: light emitting diodes above

Mar 1, 2013· Experimental demonstration of net electro-luminescent cooling in a diode, or equivalently electroluminescence with wall-plug efficiency greater than unity, had eluded direct observation for more than five decades. We review experiments demonstrating light emission from a light-emitting diode in which the electron population is pumped by a combination of electrical

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Exploring Light-Emitting Diode Pumped Luminescent

Apr 26, 2024· This review explores the various techniques employed to pump solid-state lasers using LED-LC as a pump source, along with improvements made to enhance the brightness of

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Quantum control of excitons for reversible heat transfer

Thermoelectrically pumped light emitting diodes5 and laser cooling6 –8 involve similar processes operating in reverse, with the work done on the electron-hole pairs allowing them to...

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Light Emitting Diodes and Semiconductor Lasers | SpringerLink

Oct 12, 2021· We shall start with the definition of electroluminescence. Electroluminescence is the emission of light when a current passes through a semiconductor device and the injected non-equilibrium electrons and holes recombine across the bandgap or via localized levels within the bandgap. Electroluminescence has a much smaller spectral linewidth compared to thermal

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Optically Pumped Lasing from Hybrid Perovskite Light‐Emitting Diodes

Nov 6, 2019· Electrically pumped lasing from hybrid organic–inorganic metal‐halide perovskite semiconductors could lead to nonepitaxial diode lasers that are tunable throughout the visible and near‐infrared spectrum; however, a viable laser diode architecture has not been demonstrated to date. Here, an important step toward this goal is achieved by demonstrating two distinct

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Thermophotonic cooling with light-emitting diodes

Mar 16, 2020· The status and prospects for using light-emitting diodes as a means of electroluminescent cooling are discussed. The currently ubiquitous light-emitting diodes

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Organic solid laser pumped by an organic light-emitting diode

Nov 1, 2006· Surface emission spectrum from OLED-pumped organic films for different organic films: DCM2 (open squares), Py597 (open diamonds), Py580 (open circles), and mixed film of DCM2 and Py580 (line).

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Perovskite Light-Emitting Diodes with Quantum Wires and Nanorods

Aug 25, 2024· State Key Laboratory of Photovoltaic Science and Technology, Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception, Institute of Optoelectronics, Fudan University, Shanghai, 200433 China have seen extensive application in the field of light-emitting diodes (LEDs), where research is as abundant as the

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Thermoelectrically Pumped Light-Emitting Diodes Operating

A heated semiconductor light-emitting diode at low forward bias voltage V<k B T/q is shown to use electrical work to pump heat from the lattice to the photon field. Here the rates of both radiative and nonradiative recombination have contributions at linear order in V. As a result the device''s wall-plug (i.e., power conversion) efficiency is inversely proportional to its output

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Controlling Temperatures of Diode Lasers Thermoelectrically by

For a typical diode laser emitting 3 mW at 780 nm, the emission wavelength will shift an average of 0.26 nm/°C and the threshold current will shift an average of 0.3 mA/℃. For a typical telecom DFB laser operating at 1550 nm and 20 mW, the emission wavelength will shift an average of 0.11 nm/℃ and the threshold current will change an

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Light-emitting diode pumped luminescent concentrators: A new

May 20, 2016· High-power light-emitting diodes (LEDs) today are twice as powerful as four years ago while meantime their price has been divided by 4 making them promising sources for laser pumping.

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Distributed Feedback Lasers and Light-Emitting Diodes Using 1

Jan 7, 2019· This work investigates the feasibility of using low-dimensional perovskites for electrically driven lasers given the current status of perovskite light-emitting diodes and optically pumped lasers. In our progress toward electrically driven lasers, we performed a variety of measurements on bulk and low-dimensional perovskite films to give a baseline for

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Optically Pumped Lasing from Hybrid Perovskite Light‐Emitting Diodes

Nov 6, 2019· Due to these features, perovskites found large application in photovoltaic cells [6,9], light-emitting diodes [10][11][12], and optically pumped lasers [13] [14][15]. For these devices, the study

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Ultralow-voltage operation of light-emitting diodes

Jul 4, 2022· For a light-emitting diode (LED) to generate light, the minimum voltage required is widely considered to be the emitter''s bandgap divided by the elementary charge. Here we show for many classes

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Thermoelectrically Pumped Light-Emitting Diodes Operating

A heated semiconductor light-emitting diode at low forward bias voltage V<kBT=qis shown to use electrical work to pump heat from the lattice to the photon field. Here the rates of both radiative and nonradiative recombination have contributions at linear order in V. As a

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Exploring Light-Emitting Diode Pumped Luminescent

Apr 26, 2024· In the past, there were limited efforts to use light-emitting diodes (LEDs) for pumping solid-state lasers. However, these attempts were overshadowed by the introduction of laser diodes, which

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Hybrid perovskite light emitting diodes under intense electrical

Nov 20, 2018· Hybrid organic–inorganic halide perovskite semiconductors are presently being explored for application in light emitting diodes (LEDs) and lasers because they combine high color purity with a

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Organic polaritonic light-emitting diodes with high luminance and

Aug 15, 2024· For the case of optical pumping, the density of pumped exciton (N th) is deduced from the equation N th = 0.5 P th /[z(hc/λ)] 34, where 0.5 is the transmittance of the pump laser to the top

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Organic solid laser pumped by an organic light-emitting diode.

Oct 2, 2006· We have proposed what we believe is a novel organic device pumped by an organic light-emitting diode to avoid a strong charge-induced absorption and nonradiative loss in an electrically pumped organic laser. An organic light-emitting diode was fabricated on the transparent anode substrate with a microcavity structure and driven under intense

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Design for enhanced thermo-electric pumping in light emitting diodes

Sep 17, 2013· We present a strategy for optimization of thermo-electric pumping in light emitting diodes (LEDs). We use a finite element model for charge transport in a GaInAsSb/GaSb double hetero-junction LED that is verified experimentally to consider optimal design and operation of low-bias LEDs. The wall-plug efficiency is shown to be enhanced by over 200× at nanowatt

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Quantum control of excitons for reversible heat transfer

Abstract: Lasers, photovoltaics, and thermoelectrically-pumped light emitting diodes are thermodynamic machines which use excitons (electron-hole pairs) as the working medium.

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Bright and stable near-infrared lead-free perovskite light-emitting diodes

Jan 5, 2024· Near-infrared (NIR) light-emitting diodes (LEDs) are of great interest for diverse applications including night vision, biomedical imaging, sensing and optical communications 1,2,3,4.Present-day

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Metal-halide perovskites for photovoltaic and light-emitting

May 7, 2015· This Review discusses recent developments in photovoltaic and light-emitting optoelectronic devices made from metal-halide perovskite materials. Metal-halide perovskites are crystalline materials

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About Lasers photovoltaics and thermoelectrically-pumped light emitting diodes

About Lasers photovoltaics and thermoelectrically-pumped light emitting diodes

We consider an InGaAs/GaAs quantum-dot, driven by an ultrafast laser pulse with a time-dependent amplitude and frequency. As illustrated in Fig. 1a, we model the dot as a two-level system, consisting o.

To explain how exciton-phonon heat flows can be controlled we recall the mechanism of adiabatic rapid passage using chirped pulses21, as illustrated in Fig. 1b. This figure show.

Figure 2 shows the predicted heat transferred from the phonons to the exciton for driving by a single chirped Gaussian pulse, with the dot starting in its ground state. The fi.

We now consider the thermodynamics of the exciton-phonon heat transfer process in the context of a heat engine. This will allow us to evaluate the thermodynamic performanc.

To understand why some pulses induce nearly reversible heat transfers, and others do not, we consider the temperature of the dot. In general a driven system such as the dot will not.

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