2006
DOI: 10.1063/1.2172144
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Observation of optical instabilities in the photoluminescence of InGaN single quantum well

Abstract: Photoluminescence decay dynamics in an InGaN/GaN/AlGaN single quantum well

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Cited by 16 publications
(27 citation statements)
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“…It has been reported for In 0.20 Ga 0.80 N QWs of 3.4 nm well widths that every percent increase in the indium content reduces the band‐gap of the alloy by ≈40 meV 6. Inhomogeneous compositional fluctuations are known to occur in relatively high‐indium‐fraction (≥20%) alloys, where local domains along in‐plane dimensions can comprise indium‐rich zones 7, 12, 13, 26, 40. An indium content of up to ≈40% have been shown to be present in nanometer domains within green‐light‐emitting In 0.25 Ga 0.75 N QWs,30 which can result in a lowering of the band‐gap of radiative traps by ≈600 meV.…”
Section: Discussionmentioning
confidence: 99%
“…It has been reported for In 0.20 Ga 0.80 N QWs of 3.4 nm well widths that every percent increase in the indium content reduces the band‐gap of the alloy by ≈40 meV 6. Inhomogeneous compositional fluctuations are known to occur in relatively high‐indium‐fraction (≥20%) alloys, where local domains along in‐plane dimensions can comprise indium‐rich zones 7, 12, 13, 26, 40. An indium content of up to ≈40% have been shown to be present in nanometer domains within green‐light‐emitting In 0.25 Ga 0.75 N QWs,30 which can result in a lowering of the band‐gap of radiative traps by ≈600 meV.…”
Section: Discussionmentioning
confidence: 99%
“…We note that much smaller amplitude intensity fluctuations, higher than the background noise due to CCD (in absence of the crystals, Figure S9, SI) are present throughout the crystal (marked 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 17 While photoinduced blinking behaviors are commonly observed for single semiconductor nanocrystals and fluorescent molecules [30][31] , and has also been reported for individual radiative recombination centers in quantum-well heterostructures 26,[32][33] , untill recently, PL intermittency has been rarely observed in perovskite microcrystals 34 . While there are a couple of reports on relatively large (~µm) emissive domains within InGaN quantum-well heterostructures undergoing opitcal instability [32][33] , these observations are uncommon, and it is quite surprizing that such a high density of local sub-microscopic dominains within these perovskite crystals of several micrometers exhibits such unambiguous PL intremittency.…”
mentioning
confidence: 92%
“…While there are a couple of reports on relatively large (~µm) emissive domains within InGaN quantum-well heterostructures undergoing opitcal instability [32][33] , these observations are uncommon, and it is quite surprizing that such a high density of local sub-microscopic dominains within these perovskite crystals of several micrometers exhibits such unambiguous PL intremittency. More importantly, the nature of optical instability observed for MAPbI 3-x (SCN) x crystals is also quite different from single emitters, where fluctuations in emission intensity (blinking) typically follows a two-state process, with rather sharp transitions between a distinct "on" and an "off" state 15,30,32 .…”
mentioning
confidence: 96%
“…Since the phenomenon is driven by spontaneous forces, frequencies are in the order of 1000 cm −1 (about 10THz) as shown in Raman studies and related literature [12][13][14][15]. Nevertheless, the observed blinking has components at few seconds range [5]. One may ask: how it is possible that the observed slow optical oscillations are induced by such higher frequencies?…”
Section: Theoretical Insightsmentioning
confidence: 94%
“…The blinking process results to be related to temporary quenching of photoluminescence due to highly efficient non-radiative recombination processes as for example Auger effect or other non-radiative processes [2]. Nevertheless, in InGaN devices the band structure is an infinitely wide quantum well, so a zerodimensional model is insufficient, the understanding of the blinking phenomenon remains elusive [3][4][5][6].…”
Section: Introductionmentioning
confidence: 99%