Excitation density dependence of luminescence spectrum of electron-hole plasma in diamond

Sakamoto, Y; Murayama, Kazuro; Nishioka, Yasushiro; Okushi, Hideyo

doi:10.1016/j.diamond.2009.02.015

Cited by 5 publications

(1 citation statement)

References 8 publications

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“…We correlate the PL in the high power regime to the emission of an EHL because all the spectral and spatial features, which include the substantial enhancement in intensity, the constant peak position and spectral width, the spatial expansion of the maximum region, and the formation of a luminescence ring, are consistent with the main features of an EHL previously reported. − ,,− First of all, it is known that EHP may experience a first-order phase transition into an EHL at a critical charge density and under appropriate temperature. Compared to EHP, an EHL features stronger correlation energy between electrons and holes and thereby may have stronger PL efficiency. , This is consistent with the sharp threshold-like improvement of PL efficiency observed in the transition from the middle to high power regimes.…”

Section: Resultssupporting

confidence: 73%

Room-Temperature Electron–Hole Liquid in Monolayer MoS₂

Bataller

Younts

et al. 2019

ACS Nano

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Excitons in semiconductors are usually noninteracting and behave like an ideal gas, but may condense to a strongly correlated liquid-like state, i.e., electron–hole liquid (EHL), at high density and appropriate temperature. An EHL is a macroscopic quantum state with exotic properties and represents the ultimate attainable charge excitation density in steady states. It bears great promise for a variety of fields such as ultra-high-power photonics and quantum science and technology. However, the condensation of gas-like excitons to an EHL has often been restricted to cryogenic temperatures, which significantly limits the prospect of EHLs for use in practical applications. Herein we demonstrate the formation of an EHL at room temperature in monolayer MoS2 by taking advantage of the monolayer’s extraordinarily strong exciton binding energy. This work demonstrates the potential for the liquid-like state of charge excitations to be a useful platform for the studies of macroscopic quantum phenomena and the development of optoelectronic devices.

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Section: Resultssupporting

confidence: 73%

Room-Temperature Electron–Hole Liquid in Monolayer MoS₂

Bataller

Younts

et al. 2019

ACS Nano

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Nonlinear behavior of current‐dependent emission for diamond light‐emitting diodes

Makino

Kanno

Yamasaki

et al. 2012

Physica Status Solidi (a)

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Nonlinear emission characteristics of (111)‐oriented diamond p–i–n junction light‐emitting diodes (LEDs) were investigated. We measured the superlinear increase of excitonic emission and sublinear increase of deep‐level emission due to defects and/or impurity centers depending on injected current at room temperature (RT). These characteristics could not be explained by conventional carrier trapping and recombination processes at deep levels based on simple Shockley–Read–Hall statistics. We introduced three‐step processes of carrier trapping and recombination at charged deep levels via bound states, where the bound states are stable even at RT because of low dielectric constant in diamond. Rate equation analysis based on this concept simultaneously explained the superlinear increase of excitonic emission and sublinear increase of deep‐level emission for diamond LEDs.

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