{"id":1313,"date":"2026-09-17T01:39:30","date_gmt":"2026-09-17T01:39:30","guid":{"rendered":"https:\/\/uvstry.com\/%e7%b4%ab%e5%a4%96%e5%85%89%e6%9d%80%e8%8f%8c%e5%8e%9f%e7%90%86\/"},"modified":"2026-09-17T01:39:30","modified_gmt":"2026-09-17T01:39:30","slug":"%e7%b4%ab%e5%a4%96%e5%85%89%e6%9d%80%e8%8f%8c%e5%8e%9f%e7%90%86","status":"publish","type":"post","link":"https:\/\/uvstry.com\/en\/2026\/09\/17\/%e7%b4%ab%e5%a4%96%e5%85%89%e6%9d%80%e8%8f%8c%e5%8e%9f%e7%90%86\/","title":{"rendered":"The Principle of UV Sterilisation"},"content":{"rendered":"<p><\/p>\n<p style=\"text-align: center\"><span style='color: #262626; font-family: \"Microsoft YaHei\" font-size: 26px; text-align: center; text-wrap: wrap'>The Principle of UV Sterilisation<\/span><\/p>\n<section style=\"box-sizing: border-box; color: rgb(102, 102, 102); font-family: \u5fae\u8f6f\u96c5\u9ed1; font-size: 16px; text-wrap: wrap\">The basic principles of deep ultraviolet disinfection.<\/section>\n<p><section style=\"box-sizing: border-box; color: rgb(102, 102, 102); font-family: \u5fae\u8f6f\u96c5\u9ed1; font-size: 16px; text-wrap: wrap\">\u00a0<\/section>\n<section style=\"box-sizing: border-box; color: rgb(102, 102, 102); font-family: \u5fae\u8f6f\u96c5\u9ed1; font-size: 16px; text-wrap: wrap\">Why is deep ultraviolet light used for disinfection, rather than blue, green or infrared light?<\/section>\n<section style=\"box-sizing: border-box; color: rgb(102, 102, 102); font-family: \u5fae\u8f6f\u96c5\u9ed1; font-size: 16px; text-wrap: wrap\">\u00a0<\/section>\n<section style=\"box-sizing: border-box; color: rgb(102, 102, 102); font-family: \u5fae\u8f6f\u96c5\u9ed1; font-size: 16px; text-wrap: wrap\">Light is a type of radiation that transmits energy in the form of electromagnetic waves or particles, and is governed by the following photochemical laws and principles:<\/section>\n<section style=\"box-sizing: border-box; color: rgb(102, 102, 102); font-family: \u5fae\u8f6f\u96c5\u9ed1; font-size: 16px; text-wrap: wrap\">\u00a0<\/section>\n<\/p>\n<ul class=\"list-paddingleft-2\" style=\"list-style-type: none\">\n<li>\n<section style=\"box-sizing: border-box\"><span style=\"box-sizing: border-box; font-weight: bolder\">The First Law of Photochemistry<\/span>\uff1a<\/section>\n<section style=\"box-sizing: border-box\">Light must be absorbed by molecules in order for a photochemical reaction to take place.<\/section>\n<section style=\"box-sizing: border-box\">\u00a0<\/section>\n<\/li>\n<li>\n<section style=\"box-sizing: border-box\"><span style=\"box-sizing: border-box; font-weight: bolder\">The Second Law of Photochemistry<\/span>\uff1a<\/section>\n<section style=\"box-sizing: border-box\">A single absorbed photon can only activate one molecule to participate in the reaction.<\/section>\n<section style=\"box-sizing: border-box\">\u00a0<\/section>\n<\/li>\n<li>\n<section style=\"box-sizing: border-box\"><span style=\"box-sizing: border-box; font-weight: bolder\">Photochemical reaction<\/span>\uff1a<\/section>\n<section style=\"box-sizing: border-box\">Chemical reactions in substances, generally triggered by exposure to visible light or ultraviolet radiation, are reactions initiated when the molecules of the substance absorb photons.<\/section>\n<section style=\"box-sizing: border-box\">\u00a0<\/section>\n<\/li>\n<li>\n<section style=\"box-sizing: border-box\"><span style=\"box-sizing: border-box; font-weight: bolder\">The most fundamental photochemical processes<\/span>\uff1a<\/section>\n<section style=\"box-sizing: border-box\">When the energy of a photon absorbed by a molecule is greater than or equal to the dissociation energy of a particular chemical bond within the molecule, the molecule dissociates directly\u2014a process known as photodissociation.<\/section>\n<section style=\"box-sizing: border-box\">\n<p style=\"box-sizing: border-box; margin-top: 0px; margin-bottom: 0px\"><img decoding=\"async\" id=\"10077190\" src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/pg2024011708220329544\/cms\/image\/0efac0b1-19cf-4f0d-b76c-3ab2b99bd2f2.JPG\" style=\"box-sizing: border-box; vertical-align: middle; border-style: none; filter: blur(0px); transition: all 0.3s ease 0s\"\/><\/p>\n<section style=\"box-sizing: border-box\">We often talk about the length of a wavelength, but what is the relationship between wavelength and energy?<\/section>\n<section style=\"box-sizing: border-box\">\u00a0<\/section>\n<section style=\"box-sizing: border-box\">Formulae for energy and wavelength conversion:<\/section>\n<section style=\"box-sizing: border-box\">\u00a0<\/section>\n<section style=\"box-sizing: border-box\"><span style=\"box-sizing: border-box; font-weight: bolder\">E (energy) = 1240\/\u03bb (wavelength)<\/span><\/section>\n<section style=\"box-sizing: border-box\">\u00a0<\/section>\n<section style=\"box-sizing: border-box\">The derivation of this formula is as follows:<\/section>\n<section style=\"box-sizing: border-box\">\u00a0<\/section>\n<section style=\"box-sizing: border-box\">Unit:<\/section>\n<section style=\"box-sizing: border-box\">\u00a0<\/section>\n<section style=\"box-sizing: border-box\">E (energy) \u2014 eV (electronvolts);<\/section>\n<section style=\"box-sizing: border-box\">h (Planck\u2019s constant) \u2014 6.63 \u00d7 10<span style=\"box-sizing: border-box; vertical-align: baseline; position: relative; font-size: 12px; line-height: 0; top: -0.5em\">-34<\/span>J\u2022s (joule-seconds);<\/section>\n<section style=\"box-sizing: border-box\">k (constant) \u2014 1.6\u00d710<span style=\"box-sizing: border-box; vertical-align: baseline; position: relative; font-size: 12px; line-height: 0; top: -0.5em\">-19<\/span>J\/eV;<\/section>\n<section style=\"box-sizing: border-box\">C (speed of light) \u2014 3\u00d710<span style=\"box-sizing: border-box; vertical-align: baseline; position: relative; font-size: 12px; line-height: 0; top: -0.5em\">17<\/span>nm\/s;<\/section>\n<section style=\"box-sizing: border-box\">\u03bb (wavelength) \u2014 nm;<\/section>\n<section style=\"box-sizing: border-box\">\u00a0<\/section>\n<p style=\"box-sizing: border-box; margin-top: 0px; margin-bottom: 0px\">\u00a0<\/p>\n<section style=\"box-sizing: border-box\"><span style=\"box-sizing: border-box; font-weight: bolder\">E (energy) = 1240\/\u03bb (wavelength)<\/span><\/section>\n<section style=\"box-sizing: border-box\">\u00a0<\/section>\n<section style=\"box-sizing: border-box\">It is clear from the above formula that:<span style=\"box-sizing: border-box; font-weight: bolder\">The shorter the wavelength, the higher the frequency and the greater the energy.<\/span>, so it is the shorter-wavelength deep ultraviolet that possesses the higher photon energy required to carry out<a href=\"http:\/\/www.uvstry.cn\/product\/26\/\" style=\"box-sizing: border-box; color: rgb(112, 112, 112)\">Sterilisation and Disinfection<\/a>\u3002<\/section>\n<section style=\"box-sizing: border-box\">\u00a0<\/section>\n<section style=\"box-sizing: border-box\">\n<p style=\"box-sizing: border-box; margin-top: 0px; margin-bottom: 0px\">In theory, if the energy of a photon absorbed by a molecule is greater than the bond energy of the molecule\u2019s chemical bonds, the chemical bonds can be broken.<\/p>\n<p style=\"box-sizing: border-box; margin-top: 0px; margin-bottom: 0px\">\u00a0<\/p>\n<\/section>\n<section style=\"box-sizing: border-box\"><img decoding=\"async\" id=\"10077205\" src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/pg2024011708220329544\/cms\/image\/image-20220621180743-2.png\" style=\"box-sizing: border-box; vertical-align: middle; border-style: none; filter: blur(0px); transition: all 0.3s ease 0s\"\/><\/p>\n<p style=\"box-sizing: border-box; margin-top: 0px; margin-bottom: 0px\">For example:\u00a0<\/p>\n<section style=\"box-sizing: border-box\">If a particular UVC product operates in the 280 nm wavelength range, then using the formula for the conversion of energy to wavelength, we can calculate that E \u2248 4.51 eV.<\/section>\n<section style=\"box-sizing: border-box\">\u00a0<\/section>\n<section style=\"box-sizing: border-box\">Taking into account the bond energies of several common chemical bonds shown in the figure above, we can see that 4.51 eV is greater than the average bond energy of the C\u2013H bond (4.31 eV); therefore, the C\u2013H bond can be broken.<\/section>\n<section style=\"box-sizing: border-box\">\u00a0<\/section>\n<section style=\"box-sizing: border-box\">Based on the conclusions above, we can list several commonly used results:<\/section>\n<section style=\"box-sizing: border-box\">\u00a0<\/section>\n<p style=\"box-sizing: border-box; margin-top: 0px; margin-bottom: 0px\">1. Wavelengths of 240.3 nm or below break the oxygen\u2013oxygen bond (O\u2082) in the air, producing the more stable ozone bond (O\u2083). Consequently, the spectrum of our mass-produced UVC LEDs, which ranges from 250 to 280 nm with a half-width of approximately 10 nm, does not produce ozone (which is toxic, has a distinct odour and is harmful to human health). Mercury lamps contain spectral components below 240.3 nm; therefore, they do produce ozone.<\/p>\n<p style=\"box-sizing: border-box; margin-top: 0px; margin-bottom: 0px\"><img decoding=\"async\" id=\"10077740\" src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/pg2024011708220329544\/cms\/image\/5dd29d66-361c-465f-9644-162faec797b1.JPG\" style=\"box-sizing: border-box; vertical-align: middle; border-style: none; filter: blur(0px); transition: all 0.3s ease 0s\"\/><\/p>\n<section style=\"box-sizing: border-box\">2. Thymine (C<span style=\"box-sizing: border-box; vertical-align: baseline; position: relative; font-size: 12px; line-height: 0; bottom: -0.25em\">5<\/span>H<span style=\"box-sizing: border-box; vertical-align: baseline; position: relative; font-size: 12px; line-height: 0; bottom: -0.25em\">6<\/span>N<span style=\"box-sizing: border-box; vertical-align: baseline; position: relative; font-size: 12px; line-height: 0; bottom: -0.25em\">2<\/span>The CH bond in (O) can be broken at 287.7 nm, thereby inactivating bacteria and microorganisms.<\/section>\n<p style=\"box-sizing: border-box; margin-top: 0px; margin-bottom: 0px\">\u00a0<\/p>\n<section style=\"box-sizing: border-box\">So, you can use the conclusions drawn in this article to work out the results you are looking for.<\/section>\n<section style=\"box-sizing: border-box\">\u00a0<\/section>\n<section style=\"box-sizing: border-box\">In the next article, we shall continue to explore the underlying principles and calculations behind the application of UVC LEDs.<\/section>\n<\/section>\n<\/section>\n<\/li>\n<\/ul>\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>\u7d2b\u5916\u5149\u6740\u83cc\u539f\u7406\u6df1\u7d2b\u5916\u7ebf\u6d88\u6bd2\u7684\u57fa\u672c\u539f\u7406\u3002\u4e3a\u4ec0\u4e48\u7528\u6df1\u7d2b\u5916\u7ebf\u80fd\u6d88\u6bd2\uff0c\u800c\u4e0d\u662f\u7528\u84dd\u5149\uff0c\u7eff\u5149\uff0c\u7ea2\u5916\u5149\u5462\uff1f\u5149\u662f\u8f90\u5c04\u6ce2\u7684\u4e00\u79cd\uff0c\u4ee5\u7535\u78c1\u6ce2\u5f62\u5f0f\u6216\u7c92\u5b50\u5f62\u5f0f\u6765\u4f20\u64ad\u80fd\u91cf\uff0c\u53ef\u9075\u5faa\u4e0b\u8fb9\u51e0\u4e2a\u5149\u5316\u5b66\u5b9a\u5f8b\u4ee5\u53ca\u5b9a\u5219\uff1a\u5149\u5316\u5b66\u7b2c\u4e00\u5b9a\u5f8b\uff1a\u5149\u5fc5\u987b\u88ab\u7269\u8d28\u5206\u5b50\u5438\u6536\u624d\u80fd\u53d1\u751f\u5149\u5316\u5b66\u53cd\u5e94\u3002\u5149\u5316\u5b66\u7b2c\u4e8c\u5b9a\u5f8b\uff1a\u4e00\u4e2a\u88ab\u5438\u6536\u7684\u5149\u5b50\u53ea\u80fd\u591f\u6d3b\u5316<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[34,1],"tags":[],"class_list":["post-1313","post","type-post","status-publish","format-standard","hentry","category-news1","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.3 (Yoast SEO v28.1) - 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