LED loses efficacy

Depth analysis LED loses efficacy a problem crest
Expiration of LED product, the cause may come from the whichever part of that product, past have to go down to details then can find out real of expired reason.Aim at expiration to come from LED light grain but speech, because of integrity of in the LED light grain, LED the chip is very strong, but wrap to reply sealing of chip to pack the material then easily suffers harm, therefore, the expiration of the LED light grain much can attribute to pack material of break or inferior turn cause.

LED gives out light a source the compound is from so-called III-V constitute, then the Lei clear and bright grain(chip) that everyone is familiar with, the solid’s compound contains stable property, at product under the condition of norm the usage also don’t easily damage, and be placed in general of applied environment in also not rise chemical reaction, lamp designs reformtherefore own longer product life span.However, in order to make the LED’s chip given out light, have to be opened into electric current by the external world, therefore generally will stick the size pimping chip in particularly carrying Taiwan(or call to lead a line) combine with plus or minus two poleses of the metal material conjunction chips, such as line and 銲 tin…etc., then use the high mark sub- material the pack reply whole carry Taiwan, this is to so-calledly seal to pack a manufacturing process and become a familiar LED light grain of on the market after this manufacturing process.At physically applied, also see need to assemble several LED light grain into module, finally become a terminal product with the module combination of other functions again.

Can know from the top,LED lamp export expiration of LED product, the cause may come from the whichever part of that product, past have to go down to details then can find out real of expired reason.Aim at expiration to come from LED light grain but speech, because of integrity of in the LED light grain, LED the chip is very strong, but wrap to reply sealing of chip to pack the material then easily suffers harm, therefore, the expiration of the LED light grain much can attribute to pack material of break or inferior turn cause.If want to well analyze this expiration, concern optics, chemistry and material to learn, the professional knowledge of electronics physics etc. realm, and match precise instrument with abundant of actual situation experience, then can confirm expiration to order and deduce true because of, then put forward an improvement counterplan.

1.Not bright:This kind of expiration means that LED completely doesn’t give out light after switching on electricity.Generally speaking, conduct electricity path up of”breaking road(open)” is this type of one of the main cause of expiration, the confirmation breaks the method of road also very simple, with familiar of three use electricity and then can verify.However, find out to break road to order and then have to do further resolution,LED televisionfor example:Can confirm to beat with the X-ray whether the line breaks line or escapes from, uses SEM(sweep a take aim type electronic microscope) observation section the structure can check the blemish of sticking to the crystal part etc..This type of expiration the second main cause is “short circuit(short)”, this because the electric current didn’t really pass LED chip, but is flow through “the side heresy in the door”, the past LED light grain nature can’t give out light, such as:Because electronics migration happen to cause electrode metal atom not to spread as usual, like oxidize Yin tin(ITO), silver or GaN|InGaN countercheck layer within diode metal etc. all may because of machine in response to dint, high electric current density or at causticity of environment occurrence this kind strange appearance.Other reason may be beat line to be partial to move, the sticky crystal gum climb gum etc..This kind of expiration has to make use of I-V, the curve(electric current-electric voltage diagram) then can judge, as for the expiration orders because can not check the above-mentioned blemish from the external appearance, so needed first to confirm with the X-ray;居家不可不知的20條風水禁忌Or chemistry aqua after cleaning a LED and packing material, again usage optics(OM) or electronic microscope(SEM) are careful to check.

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