Ua hoʻololi ka LED kuʻuna i ke kula o ke kukui a me ka hōʻike ma muli o kā lākou hana kiʻekiʻe ma ke ʻano o ka pono, kūpaʻa a me ka nui o ka mīkini.ʻO nā LED ka mea maʻamau o nā kiʻiʻoniʻoni semiconductor lahilahi me nā ana ʻaoʻao o nā millimeters, ʻoi aku ka liʻiliʻi ma mua o nā mea hana kahiko e like me nā ʻōpuʻu incandescent a me nā paipu cathode.Eia nō naʻe, ʻo nā noi optoelectronic e puka mai ana, e like me ka virtual a me ka mea i hoʻonui ʻia, pono nā LED i ka nui o nā microns a i ʻole ka liʻiliʻi.ʻO ka manaʻolana ʻo ka micro - a i ʻole submicron scale LED (µleds) e hoʻomau i ka nui o nā ʻano maikaʻi i loaʻa i nā led kuʻuna, e like me ka hoʻokuʻu paʻa loa, ka hana kiʻekiʻe a me ka ʻōlinolino, ka hoʻohana ʻana i ka mana haʻahaʻa haʻahaʻa, a me ka hoʻoiho kala piha. ʻoiai ʻoi aku ka liʻiliʻi o ka miliona miliona ma ka ʻāpana, e ʻae ana i nā hōʻike paʻakikī.Hiki i ia mau ʻāpana alakaʻi ke wehe i ke ala no nā kaapuni photonic ʻoi aku ka ikaika inā hiki ke hoʻonui ʻia i hoʻokahi chip ma Si a hoʻohui pū ʻia me nā mea uila metala oxide semiconductor (CMOS).
Eia nō naʻe, i kēia manawa, ʻaʻole paʻa kēia mau µled, ʻoi aku ka nui o ka ʻōmaʻomaʻo a i ka ʻulaʻula.ʻO ke ala kuʻuna µ-alakaʻi alakaʻi ʻia he kaʻina hana i luna i lalo kahi i hoʻopaʻa ʻia ai nā kiʻiʻoniʻoni InGaN quantum well (QW) i loko o nā polokalamu micro-scale ma o ke kaʻina etching.ʻOiai ʻo nā kiʻi ʻoniʻoni ʻoniʻoni InGaN QW-based tio2 µleds ua hoʻokipa nui ʻia ma muli o ka nui o nā waiwai maikaʻi o InGaN, e like me ka lawe ʻana i ka mea lawe lawe maikaʻi a me ka tunability lōʻihi o ka nalu ma nā ʻāpana ʻike ʻia, a hiki i kēia manawa ua hoʻopilikia ʻia lākou e nā pilikia e like me ka paia ʻaoʻao. ʻinoʻino e ʻoi aku ka nui o ka nui o ka mīkini.Eia kekahi, ma muli o ka noho ʻana o nā māla polarization, loaʻa iā lākou ka nalu lōʻihi / kala.No kēia pilikia, ua manaʻo ʻia nā InGaN non-polar a me semi-polar a me ka photonic crystal cavity solutions, akā ʻaʻole lākou i ʻoluʻolu i kēia manawa.
Ma kahi pepa hou i paʻi ʻia ma Light Science and Applications, ua hoʻomohala nā mea noiʻi i alakaʻi ʻia e Zetian Mi, he polopeka ma ke Kulanui o Michigan, Annabel, i kahi submicron scale ʻōmaʻomaʻo LED iii - nitride e lanakila ana i kēia mau pilikia i hoʻokahi manawa.Hoʻopili ʻia kēia mau µled e ka epitaxy molecular beam epitaxy i kōkua ʻia e ka plasma.Ma kahi ʻokoʻa loa i ka ʻaoʻao kuʻuna luna-lalo, ʻo ka µled ma aneʻi he ʻano nanowires, kēlā me kēia 100 a 200 nm wale nō ke anawaena, i hoʻokaʻawale ʻia e nā ʻumi nanometer.ʻAʻole pono kēia ala i lalo i luna i ka pōʻino ʻino o ka paia lateral.
ʻO ka ʻāpana hoʻomāmā o ka hāmeʻa, ʻike ʻia hoʻi ʻo ka ʻāina hana, ua haku ʻia me nā hale kumu-shell multiple quantum well (MQW) i hōʻike ʻia e ka nanowire morphology.ʻO ka mea kūikawā, aia ka MQW i ka pūnāwai InGaN a me ka pale AlGaN.Ma muli o nā ʻokoʻa o ka neʻe ʻana o ka atom i hoʻopili ʻia o nā mea hui III indium, gallium a me ka alumini ma nā paia ʻaoʻao, ua ʻike mākou ua nalowale ka indium ma nā paia ʻaoʻao o nā nanowires, kahi i uhi ʻia ai ka pūpū GaN/AlGaN i ke kumu MQW e like me ka burrito.Ua ʻike ka poʻe noiʻi ua emi mālie ka ʻike Al o kēia pūpū GaN/AlGaN mai ka ʻaoʻao injection electron o nā nanowires i ka ʻaoʻao injection puka.Ma muli o ka ʻokoʻa i loko o nā māla polarization kūloko o GaN a me AlN, ʻo ia ka leo gradient o Al ma loko o ka papa AlGaN e hoʻoulu i nā electrons manuahi, i maʻalahi ke kahe i loko o ka MQW core a hoʻohaʻahaʻa i ka instability o ka waihoʻoluʻu ma o ka hoʻemi ʻana i ke kahua polarization.
ʻO kaʻoiaʻiʻo, uaʻike nā mea noiʻi no nā mea i emi iho ma mua o hoʻokahi micron i ke anawaena,ʻo ka lōʻihi o ka nalu o ka electroluminescence, a iʻole ka hoʻokuʻuʻana o ka māmā i kēia manawa, e mau ana i kahi kauoha o ka nui o ka hoʻololiʻana i ka injection o kēia manawa.Eia kekahi, ua hoʻomohala mua ka hui o Polofesa Mi i kahi ala no ka hoʻoulu ʻana i nā pale GaN kiʻekiʻe ma luna o ke silika e ulu i nā alakaʻi nanowire ma ke kilika.No laila, noho kahi µled ma kahi substrate Si i mākaukau no ka hoʻohui ʻana me nā mea uila CMOS ʻē aʻe.
Loaʻa i kēia µled i nā noi he nui.E ʻoi aku ka ikaika o ke kahua o ka mea hana i ka wā e hoʻonui ai ka lōʻihi o ka hawewe o ka hōʻike RGB i hoʻohui ʻia ma ka chip i ka ʻulaʻula.
Ka manawa hoʻouna: Jan-10-2023