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Guide to Buy WLEDs in Green Earth

Guide to Buy WLEDs in Green Earth

2021-10-11
Green Earth
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On this page, you can find quality content focused on WLEDs. You can also get the latest products and articles that are related to WLEDs for free. If you have any questions or want to get more information on WLEDs, please feel free to contact us.

Shenzhen Green Earth Opto-Electronic Co., Ltd develops and produces WLEDs for various application upon request. Its design starts with considering the needs of the user, but it is added with fashion, style, and personality thereafter, which makes the product aesthetic, fashionable, and practical. As product design, manufacturing processes, materials, and technology continue to improve, the product will be improved accordingly, showing a wider application in the future.WLEDs is vital for Shenzhen Green Earth Opto-Electronic Co., Ltd to achieve business success. Cast by raw materials which meet the quality standards, it is featured by a high degree of stability and long-term durability. In order to meet international standards for quality, preliminary tests are repeatedly implemented. The product gains more recognition from the customers by its stable performance.We dedicate ourselves into diversifying and optimizing the service. Not only we offer customers service to satisfy needs of different customers, but we guarantee the shipping service totally safe and reliable. Moreover, the shipping method of the products including WLEDs is also customizable at Green Earth.
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Gallium Oxide White LED Prospects
Gallium Oxide White LED Prospects
Saga University in Japan has reported work towards white light-emitting diodes (WLEDs) based on rare-earth (RE)-doped gallium oxide (Ga2O3) [Yafei Huang et al, Appl. Phys. Lett., v119, p062107, 2021]. The researchers adopted a vertical integration strategy with Ga2O3 layers doped with thulium (Tm), europium (Eu) and erbium (Er) grown on top of each other. The team comments that “films grown by lateral integration are deposited side-by-side, while the co-doping of multiple rare earth elements into the same host will unavoidably degrade the crystal quality and, thus, induce undesirable threshold voltage and luminous efficiency.” The vertical strategy leads to more compact devices without compromising crystal quality. The team adds: “On the other hand, compared with phosphor-assisted WLEDs, direct white light emissions are achieved from single-material-based LEDs in this work without using additional red, blue or green phosphors, which can greatly reduce the energy re-absorption effect between different phosphors.” Such energy re-absorption would naturally impact power efficiency. The researchers also see the phosphor-free approach based on single-material-based WLEDs with direct primary color mixing as more conducive to displays based on smaller-pixel micro-LEDs. Although rare-earth doping has been tried in gallium nitride and zinc oxide devices, there are problems such as needing high voltages (~100V) or poor color balance due to spectral gaps. The Saga team sees β-Ga2O3 as “an ideal host for rare-earth ions benefiting from its ultrawide bandgap (4.9eV), which is advantageous to improve the thermal stability and luminous ability of rare-earth dopants at room temperature”. According to the researchers, at present, “there are no reports available related to full-color (white) LEDs based on rare-earth-doped Ga2O3.” The doped Ga2O3 layers were deposited on p-type gallium arsenide, p-GaAs (111), using alternate-target pulsed laser deposition (PLD) at 500°C. The Ga2O3 targets were variously doped with rare-earth oxides: 1wt.% Tm2O3, 1wt.% Eu2O3 and 5wt.% Er2O3. The laser light came from a krypton fluoride (KrF) excimer laser emitting deep-ultraviolet light at 248nm wavelength. The PLD was carried out in an oxygen atmosphere at 0.1Pa pressure. The samples consisted of 150-periods of the sequence of the three types of Ga2O3 doping (Figure 1). The growth process lasted 150 minutes. Material analysis suggested that the atomic concentrations for the doped layers were 0.3% Tm, 0.5% Eu and 2.3% Er. Figure 1: Schematic structure of LED-A based on Ga2O3:(Tm+Eu+Er)/GaAs heterojunction. The LEDs featured an indium tin oxide (ITO) transparent conductor n-electrode and gold (Au) p-electrode. The ITO was applied with direct-current sputtering; the gold with electon-beam evaporation. Atomic force microscopy showed a sample surface “filled with uniformly distributed grain-like structures” with a root-mean-square roughness of 10nm. When subjected to a forward voltage of more than 8.8V, the current begins to increase rapidly. The researchers also note that the electroluminescence (EL) is only observed under forward bias, suggesting that “simultaneously injected electrons and holes are indispensable for the EL”. The researchers associate the emitted light with 4f transitions from the Eu3+, Er3+, and Tm3+ ions (Figure 2). Figure 2: (a) Current-voltage characteristics curve of LED-A. Inset: semi-log characteristics and digital photograph of LED-A at 70mA. (b) EL spectra under different operating currents. (c) EL intensities of emissions at 475, 529, and 615nm as function of injection current. (d) CIE chromaticity coordinates under different currents. The various peaks associated with the different ions were: 461 and 475nm with Tm3+; 529, 550, and 656nm with Er3+; 590, 615, and 712nm with Eu3+. Although the emissions somewhat overlap, the Tm ones are mainly in the blue range, Er green, and Eu red. The combination gives white light. The researchers explain: “Due to the existence of oxygen vacancy defects in the film, the simultaneous red, green, and blue emissions are supposed to be triggered by the defect-assisted energy transfer from the Ga2O3 host to RE3+ (Eu3+, Er3+, and Tm3+) ions.” On the basis of previous reports, the researchers expect the emission to be relatively independent of the temperature environment since the complete outer 5s and 5p orbitals shield the 4f shell from such influence. The positions of the peaks were found to vary little with changing current injection. However, the strength of the emissions did vary, with the balance shifting from red to green and blue as the current increases. The color content of the main device reported, LED-A, shifted from pink to white with injections from 40mA to 80mA. The correlated color temperature (CCT) varied from 2370K to 7592K, respectively, a shift from a warm to cold tone. The team reports: “For instance, the emitted light at 55mA locates at a warm-white point with CIE coordinates of (0.3739, 0.3410) and CCT of 3926K, which meets the requirements for indoor lighting applications.” The researchers also see 65mA as providing “superior” CIE coordinates, (0.3329, 0.3335), but 5479K CCT, suitable for indoor/outdoor cold-white illumination. Table 1: Thicknesses of doped Ga2O3 layers. The color balance was also varied in hardware, with the researchers producing four other device structures with different layer thicknesses of the various components (Table 1). These resulted in different color balance behavior (Figure 3). Figure 3: CIE chromaticity diagrams for (a) LED-a, (b) LED-b, (c) LED-c, and (d) LED-d under different operating currents. The author Mike Cooke is a freelance technology journalist who has worked in the semiconductor and advanced technology sectors since 1997.
How to Judge the Quality of LED Downlight More Scientifically
How to Judge the Quality of LED Downlight More Scientifically
introductionLed downlights are mostly used for commercial lighting and home lighting. They are loved by people for their health, beauty, energy saving and environmental protection. But the products on the market are mixed, so how to identify the quality of LED downlight? Xiaobian teaches you how to judge the quality of LED downlight from an objective point of view.1、 See if there is any abnormal noiseHold the LED downlight in your hand and shake it hard. Listen carefully to see if there is any abnormal noise. If there is any abnormal noise, it means that the interior of the LED downlight is not fixed well, which will directly lead to potential safety hazards. This is one of the quality problems.2、 Overall appearance and parametersWhen buying led downlight, what we need to do is to check the appearance of the lamp to see whether the lamp body is smooth, whether there are scratches, and whether the overall feel is good. The overall feel of better led downlight will be heavy, because the raw materials used are better.3、 Stroboscopic condition during useThe stroboscopic of downlights will pose a threat to visual health. It is suggested that when purchasing led downlights, you can ask the data of "stroboscopic depth".When you get the LED downlight, insert the power supply to light the LED downlight, and then use the camera function of the mobile phone to close to the light-emitting surface to observe whether there is stroboscopic phenomenon. If there is stroboscopic, it will not only affect the service life of the downlight, but also cause potential safety hazards to visual health, indicating that this led downlight is a poor product.4、 Comparison of light qualityThe downlights of the same model produced by the same manufacturer can be lit at the same time to observe whether their luminous color and brightness are the same. If they are different, they will prove to be inferior products. Theoretically, the downlights produced by the same manufacturer have no problem of inconsistent luminous color and brightness.5、 Heat dissipation performanceLight up the LED downlight, let it light up for a few minutes, and then touch the radiator behind the downlight with your hand. If there is a burning heat, it indicates that the lamp is an unqualified product.
The Difference Between Floodlight Flashlight and Spotlight Flashlight
The Difference Between Floodlight Flashlight and Spotlight Flashlight
If you are not a professional flashlight enthusiast, you will often be confused when you buy a flashlight. I don’t know what to buy, such as floodlight flashlight and spotlight flashlight. Many people don’t know what the difference is.Today we will take you to understand what is a floodlight flashlight, what is a spotlight flashlight, and the advantages and disadvantages between the two.Floodlight flashlightThe center spot light beam of the floodlight flashlight is slightly concentrated, the diffuse light of the floodlight area is large, the viewing angle is large, the illumination range is wide, and the light is soft and not glare.Floodlight flashlights produce highly diffuse, non-directional light rather than sharply defined beams, resulting in soft, transparent shadows that are used to illuminate objects much slower than when illuminated with spotlight flashlight. Even some floodlights with very slow illumination tend to look like a light source that does not produce shadows.Spot performance: The center spot is strong, and the flood area is weak. The floodlight area has a smooth transition with the central spot boundary. floodlight flashlight does not mean a completely scattered beam. The floodlight has a strong central spot. The astigmatism like a street lamp or indoor ceiling light has no central spot. It is relatively concentrated. Flooding in terms of light.Advantages: The central spot is strong, the light distribution in the floodlight flashlight area is uniform, the viewing angle is large, and the illumination range is wide. It is suitable for medium and long distance illumination, and the object covered by the light is clear and not glare.Disadvantages: The illumination distance is not far enough, and the light is slightly dispersed. Application areas: outdoor sports, camping, hiking, night riding, fishing, mountain climbing, home, search and rescue activities that require soft, large-area lighting. In the dark wild jungle or deserted desert, in the dark we are more eager to understand the surrounding environment, and the range of the floodlight flashlight can also meet the demand.Spotlight flashlightConcentrating flashlight refers to the light concentrated by using a condenser lens or a mirror. The spotlight in the center of the spotlight is bright, and the brightness outside the center spot is low. The spotlight flashlightflashes a directed, well-defined beam to illuminate a specific light. region. The center spot is small and strong, and the long-range effect is very good. Usually, the mirror (glossy) reflector is used with the small core LED. The diameter and depth (height) of the reflector directly affect the degree of concentration. The curve design of the reflector determines the position of the beam spot and the shape of the spot.Spot performance: The center spot is small and round, and the flood area is weak. The floodlight flashlight area and the center spot are clearly demarcated, and several annular apertures (halations) often appear at the outermost periphery of the spot. Excellent spot, the center rule is round, no black spots, and the boundary is clear.Advantages: The center is bright, the light is concentrated, and the long-range effect is good, suitable for long-distance illumination.Disadvantages: the near flooding is less, the light can not spread evenly, the illumination range is small, and the concentrated part of the center spot will be very glaring when used at close range.Application areas: outdoor speed of light speed, hunting, high-speed night riding, special outdoor work and other long-distance illumination.·RELATED QUESTIONI didn't get Google Glass Explorer Edition. Is trying to learn Glass dev without the hardware a futile effort?No, you can still learn the fundamentals of Glass development without the hardware.There are three main approaches for accomplishing this:1) Visit the Mirror API documentation, get into the playground, and start hashing up some code. Download the PHP, Java, and Python library, whichever you're most comfortable with. Familiarize yourself with the jargon and converntions (timeline, bundles, menus, etc). Read the support documentation (second link below) to see how the Glass hardware actually functions. Build some apps to this specification.
My Heavy Metal Nation Spotlight: Austria?
My Heavy Metal Nation Spotlight: Austria?
MA: I am unfamiliar with Artas. Thirdmoon being my favorite from the other three. Serenity is good too. Ca not say the same about Lost Dreams, who i find boring. MA2: Belphegor, Edenbridge, Stygma IV, Astaroth, Abigor, Summoning etc.. BA: Some African metal perhaps?? *****Not a bad idea, grouping thme together, but preferably you should do it on a day when more metalheads are online.1. Professional Wrestling: How is CM Punk being Unprofessional, Narcissistic or Steal The Spotlight?I totally agree with you. #Thankyoupunk2. Avoiding Spotlight to spin up external driveYes, this is pretty annoying behavior, especially if you have multiple hard drives connected to your Mac, and to my knowledge there is no way to prevent Spotlight from doing it.Fortunately, most app launchers such as LaunchBar, Alfred, Butler, Quicksilver, etc. maintain cached file databases, so they do not spin up all your drives whenever you use them to launch an app or to search for a file. They also have a ton of other useful features. I personally would recommend Alfred or LaunchBar3. Can a neighbor shine a spotlight at your house?This is harassment Sounds like that light is also a code enforcement violation you dont strap a electrical object to a tree that is waiting for a fire to happen You can consult a attorney for a legal battle but prepared to end up bankrupt fighting it Calling 911 multiple times is illegal Sounds like he is a old man who has connections with the local government I think its time to just move and get a new beginning4. Why are Republicans bringing values back into the spotlight?because republicans are the only ones wit any values. god knows the sp*cs and f*gs aint got non5. How would you deal with your significant other being in the spotlight and adored by a lot of fans?So long as she is not touching other men, it is okay.So long as they respect that I am seeing her and therefore not flirt and touch her, it is okay.I cannot tell a woman to not be super hot, I can only hope and pray that she will not play me nor dump me. I can only do whatever I can to keep her coming back to me, love her, give her a little cash and be a nice man to her.Welcome6. My sister took my place in the spotlight, butAre you a I am extinct, yet pretty much everybody knows what I am like.Despite what my name sounds like, I am not disgusting at all.My sister took my place in the spotlight, but nobody thinks she is as sweet as I am to people. You can still see me in the frozen aisle of most grocery stores.On the periodic table, I am considered to be three metals that do not fit perfectly together.Hints:7. Looney Tunes DVDs - What r the differences & similarities between Golden, Spotlight & Platinum Collection sets?Looney Tunes Golden Collection Episodes8. Should the Olympics be free from politics, or should it be used to spotlight world issues?The olympics are a GIANT revenue source for the host country. The fact that they are hosted by one country vs another is politics. Bill Richardson suggested that we should threaten to boycott the China olympics if they do not take a harder line against Sudan. I think he's right. If we are boycott a country because they wo not support our war in Iraq, why not boycott olympics in a country to get them to help stop a genocide?9. Applications Don't Show Up in SpotlightLoading the metadata plist worked for me:Now everything is being reindexed as expected.In newer versions of macOS, just turning indexing off then back on again resolves the issue10. Is it ironic that the state, Iowa, that launched Obama into the spotlight is now under water?why is he not there to help them out11. Single application not showing up in SpotlightI had a very similar issue recently where some apps just did not want to show up after moving all my data to a new Mac. I tried all the suggested solutions, yet nothing has helped. Inspecting the apps in more details, I noticed that they had "eXtended ATTRibutes" (xattr) which were named:These attributes, among others, are set when files are copied within Finder. In case you ever wondered why apps getting copied are grayed out until the copy has finished and how the Finder can show copy progress within the Finder window itself (and not just within the copy dialog) - that's all done by different kind of attributes that are set on the file and telling the system that this file/folder/bundle is just being copied and how much of it already was copied.Usually Finder removes all these attributes after copy, but somehow these attributes got stuck in my case and with these attributes set, Spotlight refuses to show the apps, thinking they are still in the process of getting copied. I had to manually remove them to fix that problem:With PATH being the full path to the application (just drag it from Finder into a Terminal window and the full path is written there). Depending on access permissions/ownership, you may have to prepend the commands with sudo to gain extended privileges.I thought it may be helpful to share that information with the world, that's why I am posting it here
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