White LEDs
Colorimetry and efficiency of white LEDs : Spectral width dependence
... mercial white LEDs involves a blue-emitting InGaN diode pumping a yellow ...of white due to differential ageing of the phosphor and/or LED have to be taken into ...
5
Using Three-Component Hierarchical Structures to Improve the Light Extraction from White LEDs Based on Red-Green-Blue Color Mixing Method
... mixing white LEDs, various methods have been ...promising white LEDs fabrication method due to its high luminescence quantum yield, good photo-stability, size-tunable emission, and cheap ...
12
Uncertainty of spectral mismatch factor for Spot White (LEDS) and Compact Fluorescent Lamps
... Spot White Light Emitting Diodes Lamps (LEDs) and Compact Fluorescent Lamps (CFLs) by applied the method of ISO Guide to Expression of Uncertainty in ...Spot White Light Emitting Diodes Lamps ...
8
Phosphor Free Apple White LEDs with Embedded Indium Rich Nanostructures Grown on Strain Relaxed Nano epitaxy GaN
... apple-white LEDs, a stacked MQWs structures made up of MQWs with embedded nanostructures fol- lowed by conventional InGaN/GaN MQWs were grown on GaN (sample E) and nano-ELO GaN template (sample F) before it ...
7
How Do White LEDs’ Spectra Affect the Fresh Weight of Lettuce Grown under Artificial Lighting in a Plant Factory?—A Statistical Approach
... broad-spectrum white-LEDs by 2010, and many types of white-LEDs for home and office uses are now available for plant factory ...these white-LEDs can be used as effective light ...
18
Multi-Azimuth Failure Mechanisms in Phosphor-Coated White LEDs by Current Aging Stresses
... phosphor-type LEDs consists of a blue InGaN LED chip (with an area of 1 mm × 1 mm), yellow YAG: Ce 3+ yellow phosphors, a silicone epoxy lens, a silver-coated reflective layer, and other packaging materials, as ...
12
On the Temperature Dependent Excitation and Reflection Spectra of Ln3Al5O12:Ce3+ Ceramics (Ln = Y, Lu) for White LEDs
... tion of the first high brightness blue (In, Ga)N LED by Nakamura et al. in 1993, YAG:Ce and LuAG:Ce are the most common phosphors, which are applied to blue LED chips for white light application [5]. Due to these ...
6
Tunable blue green emitting wurtzite ZnS:Mg nanosheet assembled hierarchical spheres for near UV white LEDs
... future white light-emitting devices (LEDs), we have calculated the CIE chromaticity coordi- nates for all the samples using a CIE calculation ...to white, which im- plies that by careful design and ...
8
Borate Glasses for Luminescence Applications Potential Materials for White LEDs and Laser Sources
... Abstract The development of borate based glasses for luminescence applications are reviewed. The present work covers various aspects including the search and synthesis of new materials, the formation of glasses, the ...
10
Determination of Cefotaxime Sodium in Drugs via the use of Six Source of White LEDs Coupled with One Solar Cell as a Detector using CFI Analyser
... A direct method is described for the determination of cefotaxime sodium in drugs and pure formulations using six LEDs for turbidimtric measurements and one solar cell as a detector. The method is based on ...
9
Implications of phosphor coating on the thermal characteristics of phosphor-converted white LEDs
... of LEDs exhibit a blue peak emission of ~450 nm at 20 ...bonded LEDs exhibit a high external quantum efficiency of ~43% at 20 °C and reduce steadily with higher operating ...bonded LEDs have a lower ...
7
Remote Pyramid Shaped Phosphor Coating for Phosphor Converted White LEDs
... However, the 3D phosphor pc-LED showed an incremental increase in effica- cy at all currents, and as the forward current increased the efficiency increment also rose. An 8% increase was observed at 100mA and 14% increase ...
9
A sliding mode contact electrification based triboelectric-electromagnetic hybrid generator for small-scale biomechanical energy harvesting
... 500 MΩ shown in Additional file 1: Figure S2. The EMG component shows the peak power of 4 mW at 5 kΩ load resistance as shown in Fig. 4a, c. The voltage response of both TENG and EMG device was concerning change in ...
8
Phosphor Converted White Led with Improved CRI
... approach, white LEDs are made by coating near ultraviolet (n-UV) emitting LED with a mixture of high efficiency red, green and blue emit- ting phosphors [3], analogous to the fluorescent ...
6
Growth, nutritional quality, and energy use efficiency in two lettuce cultivars as influenced by white plus red versus red plus blue LEDs
... blue LEDs supplemented with UV, green or far-red light compared with those grown under red plus blue ...blue LEDs, respectively (Table ...blue LEDs resulted in higher leaf and root fresh weights of ...
8
Liquid Type Nontoxic Photoluminescent Nanomaterials for High Color Quality White Light Emitting Diode
... QD-based LEDs have been demonstrated by using GQDs and porous Si (P-Si) ...QD LEDs offers a low-cost and simple fabrication approach over electroluminescent (EL) QD LEDs [30, ...neutral white ...
9
In vitro s eedlings of Eustoma grandiflorum in 1 response to LED light in an acclimation
... blue LEDs increase leaf number and leaf width of Eustoma under ex vitro acclimation; however, 163. there was no significant difference in leaf length between the blue and white LEDs ( F[r] ...
11
ZIGBEE BASED COLOR TRANSFORMATION FOR BLIND IN WIRELESS NETWORK
... two white LEDs, while an array of photo detectors (each with a red, green, blue and clear filter) interpret the colour being reflected by means of a square wave output whose frequency is proportional to the ...
11
Radiometric analysis of LEDs and the use of rapidly pulsed infrared LEDs for portable sensing of gases
... these LEDs are developed within last five ...instrumentals, LEDs are the foremost choice because of its compact ...of LEDs are automatic titrator and optical end-point detection in ...or white ...
138
A novel randomly textured phosphor structure for highly efficient white light emitting diodes
... years, white light-emitting diodes (LEDs) have become important sources of illumination because of their high brightness, reliability, low power consump- tion, and long lifetime compared to conventional ...
5