Estimate of the quality of epitaxial p-n structures by the external quantum yield of radiation

1981 ◽  
Vol 24 (1) ◽  
pp. 83-84
Author(s):  
V. Yu. Rogulin ◽  
V. �. Shub ◽  
A. A. Shlenskii ◽  
E. V. Popova
Keyword(s):  
Quantum Yield ◽  
External Quantum Yield

scholarly journals Влияние висмута на свойства упругонапряженных гетероструктур AlGaInAsP<Bi>/InP

2019 ◽  
Vol 53 (8) ◽  
pp. 1110
Author(s):  
М.Л. Лунина ◽  
Л.С. Лунин ◽  
Д.Л. Алфимова ◽  
А.С. Пащенко ◽  
Э.М. Данилина ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Quantum Yield ◽  
Temperature Gradient ◽  
Indium Phosphide ◽  
Luminescence Properties ◽  
Gradient Field ◽  
Epitaxial Layers ◽  
Structural Perfection ◽  
External Quantum Yield

AbstractThe results of growing elastically stressed AlGaInAsP〈Bi〉 thin epitaxial layers from the liquid phase on indium phosphide substrates in a temperature-gradient field are discussed. The effect of bismuth on the structural perfection, the luminescence properties, and the external quantum yield of AlGaInAsP〈Bi〉/InP heterostructures is investigated.

scholarly journals Квантовый выход кремниевого лавинного фотодиода в диапазоне длин волн 120-170 nm

2020 ◽  
Vol 90 (8) ◽  
pp. 1386
Author(s):  
П.Н. Аруев ◽  
В.П. Белик ◽  
В.В. Забродский ◽  
Е.М. Круглов ◽  
А.В. Николаев ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Wavelength Range ◽  
Bias Voltage ◽  
Reverse Bias ◽  
Avalanche Photodiode ◽  
Reverse Bias Voltage ◽  
External Quantum Yield

The external quantum yield of silicon avalanche photodiode in the wavelength range of 120-170 nm was performed. It was shown that the engineered avalanche photodiode has the external quantum yield of 24-150 electron/proton under reverse bias voltage of 230-345 V, respectively. The testing of worked out avalanche photodiode by means of pulse flash of 280 and 340 nm wavelength demonstrates the speed, corresponding to the bandwidth not less than 25 MHz.

Plastic Multilayered Molecular Organic Light Emitting Diodes

1997 ◽  
Vol 488 ◽  
Author(s):  
George M. Daly ◽  
Hideyuki Murata ◽  
Charles D. Merritt ◽  
Zakya H. Kafafi ◽  
Hiroshi Inada ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Power Efficiency ◽  
Light Emitting Diodes ◽  
Hole Transport ◽  
Organic Light Emitting Diodes ◽  
Electron Transport Layer ◽  
Light Emitting ◽  
Organic Light ◽  
Device Structures ◽  
External Quantum Yield

AbstractEnhanced performance has been observed for plastic molecular organic light emitting diodes (MOLEDs) consisting of two to four organic layers sequentially vacuum vapor deposited onto patterned indium-tin oxide (ITO) on polyester films. For all device structures studied, the performance of plastic diodes is comparable to or better than their analogs on glass substrates. At 100 A/m2, a luminous power efficiency of 4.4 lm/W and external quantum yield of 2.7% are measured for a device structure consisting of two hole transport layers, a doped emitting layer and an electron transport layer on a polyester substrate. The same device made on a silica substrate has a luminous power efficiency of 3.5 lm/W and external quantum yield of 2.3%. Electrical and optical performance for comparable device structures has been characterized by current-voltage-luminance measurements and electroluminescence spectra collected normal to the emitting surface. In addition, an integrating sphere was used to collect the total light emitted and to determine the optical output coupling on glass versus plastic substrates.

Near-Infrared Quantum Cutting Material Er3+/Yb3+ Doped La2O2S with an External Quantum Yield Higher than 100%

2012 ◽  
Vol 116 (21) ◽  
pp. 11652-11657 ◽  
Author(s):  
Bo Fan ◽  
Christophe Chlique ◽  
Odile Merdrignac-Conanec ◽  
Xianghua Zhang ◽  
Xianping Fan
Keyword(s):  
Quantum Yield ◽  
Near Infrared ◽  
Quantum Cutting ◽  
External Quantum Yield

scholarly journals The Solid-State Emission of Bilirubin

2020 ◽  
Author(s):  
Ahmed El-Zohry ◽  
Taha Ahmed ◽  
Burkhard Zietz
Keyword(s):  
Solid State ◽  
Quantum Yield ◽  
Room Temperature ◽  
Crystal Quality ◽  
Biological Sensors ◽  
Frenkel Exciton ◽  
Aggregation Induced Emission ◽  
Isomerization Process ◽  
Emission Lifetime

<p>Bilirubin (BR) is a human-biological compound formed during the haem metabolism that is insoluble in most solvents. BR has shown short emission lifetime with low quantum yield in limited number of solvents, due to the non-radiative ultrafast isomerization process. However, in solid-state, red-shifted emission of long-lived species of BR are detected at room temperature, due to the aggregation-induced emission formed by Frenkel exciton of J-system. This solid-state emission of BR depends on the crystal quality of BR as shown by SEM and XRD. This study allows for better understandings of the photophysics of BR in solid-state, opening opportunities for its applications in luminescent biological sensors. </p>

scholarly journals Спектры люминесценции мощных светодиодов на основе нитрида галлия в ультрафиолетовой и фиолетовой областях спектра

2018 ◽  
Vol 52 (10) ◽  
pp. 1172
Author(s):  
В.В. Волков ◽  
Л.М. Коган ◽  
А.Н. Туркин ◽  
А.Э. Юнович
Keyword(s):  
Quantum Yield ◽  
Density Of States ◽  
Emission Spectra ◽  
Two Dimensional ◽  
Emission Power ◽  
Light Emitting ◽  
Potential Fluctuations ◽  
Long Wavelength ◽  
External Quantum Yield ◽  
A Current

AbstractThe electroluminescence spectra of high-power light-emitting diodes (LEDs) based on p – n heterostructures of the InGaN/AlGaN/GaN type emitting in the visible short-wavelength and ultraviolet spectral regions (the range from 370 to 460 nm) are investigated. The shape of spectra is described by a model taking into account a two-dimensional combined density of states and potential fluctuations. Additional long-wavelength peaks are found in emission spectra. The emission power of ultraviolet and violet LEDs reaches 233 mW at a current of 350 mA, and the external quantum yield reaches 23% at the maximum (near a current of 100 mA).

scholarly journals Quality of Supplementary Morning Lighting (SML) During Propagation Period Affects Physiology, Stomatal Characteristics, and Growth of Strawberry Plants

Plants ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 638
Author(s):  
Hao Wei ◽  
Chen Liu ◽  
Jiangtao Hu ◽  
Byoung Ryong Jeong
Keyword(s):  
Stomatal Conductance ◽  
Quantum Yield ◽  
Control Group ◽  
Stomatal Characteristics ◽  
Light Emitting ◽  
Modern Agriculture ◽  
Short Term Exposure ◽  
Supplementary Lighting ◽  
Strawberry Cultivars

Artificial light supplementation is widely used in modern agriculture. Due to their numerous advantages, light emitting diodes (LEDs) are widely used to effectively increase the yield or control the development of crops. In the present study, the effects of supplementary morning lighting (SML) with LEDs on the physiology and stomatal characteristics of strawberry plants were studied, with the aim of awakening the plant guard cells before sunrise and enabling strawberry plants to efficiently photosynthesize immediately after sunrise. Young daughter plants of ‘Maehyang’ and ‘Seolhyang’ strawberry cultivars that have just rooted were grown under LEDs with different wavelengths—white (W), red (R), mixed blue and red (BR, 1:1), and blue (B)—to investigate the effects of the SML on the physiology, stomatal characteristics, and growth. The SML was provided for 2 h at an intensity of 100 μmol·m−2·s−1 PPFD before sunrise every morning. A group without supplementary lighting was set as the control. The results showed that the different SML qualities have significantly affected the stomatal characteristics. The B SML promoted the stomatal opening more effectively compared to the other SMLs. The stomatal conductance and quantum yield (Fv/Fm) of leaves treated with the SMLs were higher than those of the control group. The B and BR SMLs most significantly affected the stomatal conductance and quantum yield (Fv/Fm). After 30 days of the SML treatments, it was observed that the B SML effectively improved the plant quality, chlorophyll content, and carbohydrate accumulation in the two strawberry cultivars. In general, a short-term exposure to blue light before sunrise can effectively improve the quality and promote the production of strawberry plants.

scholarly journals The Solid-State Emission of Bilirubin

2020 ◽  
Author(s):  
Ahmed El-Zohry ◽  
Taha Ahmed ◽  
Burkhard Zietz
Keyword(s):  
Solid State ◽  
Quantum Yield ◽  
Room Temperature ◽  
Crystal Quality ◽  
Biological Sensors ◽  
Frenkel Exciton ◽  
Aggregation Induced Emission ◽  
Isomerization Process ◽  
Emission Lifetime

<p>Bilirubin (BR) is a human-biological compound formed during the haem metabolism that is insoluble in most solvents. BR has shown short emission lifetime with low quantum yield in limited number of solvents, due to the non-radiative ultrafast isomerization process. However, in solid-state, red-shifted emission of long-lived species of BR are detected at room temperature, due to the aggregation-induced emission formed by Frenkel exciton of J-system. This solid-state emission of BR depends on the crystal quality of BR as shown by SEM and XRD. This study allows for better understandings of the photophysics of BR in solid-state, opening opportunities for its applications in luminescent biological sensors. </p>

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