Study of optical properties and up-conversion mechanism in Nd3+/Yb3+ ions co-doped SiO2-Al2O3-Na2CO3-SrF2-CaF2 glasses for green light emitting display device applications

Optik ◽  
2018 ◽  
Vol 171 ◽  
pp. 918-924 ◽  
Author(s):  
Umamaheswar G. ◽  
Devarajulu G. ◽  
Rajesh Megala ◽  
Ramesh B. ◽  
John Sushma N. ◽  
...  
Keyword(s):  
Optical Properties ◽  
Green Light ◽  
Display Device ◽  
Light Emitting ◽  
Device Applications ◽  
Co Doped

scholarly journals Green Light Emitting Tb3+ Doped Phosphors - A Review

2018 ◽  
Vol 15 (3) ◽  
pp. 252-255
Author(s):  
Ramachandra Naik ◽  
S.C. Prashantha ◽  
H. Nagabhushana ◽  
K.M Girish ◽  
Yashwanth V. Naik
Keyword(s):  
Power Plants ◽  
Fossil Fuel ◽  
Green Light ◽  
Solid State Lighting ◽  
Display Device ◽  
Preparation Technique ◽  
Light Emitting ◽  
Device Applications ◽  
Fossil Fuel Power Plants

WLEDs were the potential materials for significantly improving lighting efficiency, resulting in reduction of the excitation energy and also reduction in pollution from fossil fuel power plants. To enhance the quality of white-light, the researches on single-component phosphor are very much essential. Green light emitting phosphors are widely used in solid state lighting technology. Tb3+ ions are doped into different hosts and they are excited by UV or NUV light to emit green light. This review presents, different hosts like silicates, oxides, phosphates and titanates based Tb3+ ions doped phosphor. Attempts were made to analyse preparation technique and photoluminescence characteristics of phosphors. Finally potential material among selected materials is identified for light emitting display device applications.

EPR and optical properties of Eu2+ and Mn2+ co-doped MgSrAl10O17 blue–green light emitting powder phosphors

2016 ◽  
Vol 178 ◽  
pp. 479-486 ◽  
Author(s):  
N. Singh ◽  
Vijay Singh ◽  
G. Sivaramaiah ◽  
J.L. Rao ◽  
Pramod K. Singh ◽  
...  
Keyword(s):  
Optical Properties ◽  
Green Light ◽  
Light Emitting ◽  
Co Doped

Luminescence Properties of InGaN/GaN Green Light-Emitting Diodes with Si-Doped Graded Short-Period Superlattice

2021 ◽  
Vol 21 (11) ◽  
pp. 5648-5652
Author(s):  
ll-Wook Cho ◽  
Bom Lee ◽  
Kwanjae Lee ◽  
Jin Soo Kim ◽  
Mee-Yi Ryu
Keyword(s):  
Optical Properties ◽  
Decay Time ◽  
Stark Effect ◽  
Light Emitting Diodes ◽  
Green Light ◽  
Time Resolved ◽  
Light Emitting ◽  
Quantum Confined Stark Effect ◽  
Short Period ◽  
Si Doped

The optical properties of InGaN/GaN green light-emitting diodes (LEDs) with an undoped graded short-period superlattice (GSL) and a Si-doped GSL (SiGSL) were investigated using photoluminescence (PL) and time-resolved PL spectroscopies. For comparison, an InGaN/GaN conventional LED (CLED) without the GSL structure was also grown. The SiGSL sample showed the strongest PL intensity and the largest PL peak energy because of band-filling effect and weakened quantum- confined stark effect (QCSE). PL decay time of SiGSL sample at 10 K was shorter than those of the CLED and GSL samples. This finding was attributed to the oscillator strength enhancement by the reduced QCSE due to the Coulomb screening by Si donors. In addition, the SiGSL sample exhibited the longest decay time at 300 K, which was ascribed to the reduced defect and dislocation density. These results indicate that insertion of the Si-doped GSL structure is an effective strategy for improving the optical properties in InGaN/GaN green LEDs.

Optical properties of laser sintered polyamide 12

2015 ◽  
Vol 21 (4) ◽  
pp. 443-448 ◽  
Author(s):  
Mengqi Yuan ◽  
David L. Bourell
Keyword(s):  
Optical Properties ◽  
Plate Thickness ◽  
Monochromatic Light ◽  
Green Light ◽  
Wavelength Dependence ◽  
Light Transmittance ◽  
Content Type ◽  
Light Emitting ◽  
Polyamide 12 ◽  
Lighting Conditions

Purpose – The purpose of this paper is to report selected optical properties of laser sintered polyamide 12 blank plates under different monochromatic and white light conditions and to apply these properties in production of laser sintered lithophanes. Design/methodology/approach – A UNICO 1201E spectrophotometer was used to measure the transmittance of laser sintered polyamide 12 plates as a function of plate thickness. Monochromatic light-emitting diodes were used to assess the wavelength dependence on the transmission and contrast as captured by a SONY DSC-W55 camera. Findings – The transmittance decreased with increasing plate thickness which varied significantly depending on the monochromatic wavelength. Highest transmission was observed using green light (525 nm) and poorest transmission was measured for yellow light (589 nm). Research limitations/implications – There is a limit to the amount of contrast obtained in polyamide lithophanes because the thickness of the plates is limited to less than about 5 mm. Greater thickness results in discernible topology on the lithophane which impairs the quality of the image. Originality/value – Light transmittance of polyamide 12 plates under different lighting conditions is reported and applied to optically defined laser sintered lithophanes.

Structural and optical properties of semi-polar (11-22) InGaN/GaN green light-emitting diode structure

2018 ◽  
Vol 112 (5) ◽  
pp. 052105 ◽  
Author(s):  
Guijuan Zhao ◽  
Lianshan Wang ◽  
Huijie Li ◽  
Yulin Meng ◽  
Fangzheng Li ◽  
...  
Keyword(s):  
Optical Properties ◽  
Light Emitting Diode ◽  
Green Light ◽  
Diode Structure ◽  
Structural And Optical Properties ◽  
Light Emitting

scholarly journals Using Pre-TMIn Treatment to Improve the Optical Properties of Green Light Emitting Diodes

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
Bing Xu ◽  
Hai Tao Dai ◽  
Shu Guo Wang ◽  
Fu-Chuan Chu ◽  
Chou-Hsiung Huang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Quantum Wells ◽  
Radiative Decay ◽  
Light Emitting Diodes ◽  
Light Output ◽  
Green Light ◽  
Time Resolved ◽  
Light Emitting ◽  
Transmission Electron ◽  
Green Led

We investigated the effects of pre-TMIn treatment on the optical properties of green light emitting diodes (LEDs). Although pre-TMIn treatment did not affect the epitaxial structure of quantum wells, it significantly improved the quality of the surface morphology relative to that of the untreated sample. Indium cluster can be seen by high-resolution transmission electron microscopy (HR-TEM), which is the explanation for the red-shift of photoluminescence (PL). Time-resolved photoluminescence measurements indicated that the sample prepared with pre-TMIn treatment had a shorter radiative decay time. As a result, the light output power of the treated green LED was higher than that of the conventional untreated one. Thus, pre-TMIn treatment appears to be a simple and efficient means of improving the performance of green LEDs.

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