I ka wā mua, ua hoʻohana ʻia nā LED e like me nā kukui hōʻailona i nā mea kani a me nā mika. Ma hope mai, ua hoʻohana nui ʻia nā LED o nā waihoʻoluʻu like ʻole i nā kukui kaʻa a me nā hōʻike -a nui, e hoʻohua ana i nā pono waiwai a me ka pilikanaka. No ka laʻana, he 12-ʻīniha ʻulaʻula kaʻa uila ma ʻAmelika Hui Pū ʻIa i hoʻohana mua i ka -ola lōʻihi, haʻahaʻa haʻahaʻa 140-watt ʻōpuʻu kukui e like me kona kumu kukui, e hana ana i 2000 lumens o ke kukui keʻokeʻo. Ma hope o ka hele ʻana i kahi kānana ʻulaʻula, ua nalowale ka 90% o ke kukui, waiho wale i 200 lumens o ke kukui ʻulaʻula. I loko o kāna kukui hou i hoʻolālā ʻia, ua hoʻohana ʻia nā LED ʻulaʻula 18, e hoʻopau wale ana i 14 watts me nā poho kaapuni, e hana i ka efficacy luminous like.
ʻO nā kukui hōʻailona automotive kekahi wahi noi nui no nā kumu kukui LED. I ka makahiki 1987, ua hoʻomaka koʻu ʻāina e hoʻokomo i -kiʻekiʻe i kau ʻia i nā kukui brake ma nā kaʻa. Ma muli o ka wikiwiki o ka pane ʻana o nā LED (nānosecond level), hiki ke hoʻomaopopo ʻia nā mea hoʻokele o nā kaʻa e pili ana i nā kūlana kaʻa ma mua, e hōʻemi ana i ka hui ʻana o ka hope.
Eia hou, hoʻohana ʻia nā kukui LED ma waho o ka ʻulaʻula, ʻōmaʻomaʻo, a me ka uliuli piha -hōʻike kala, kī kī-ʻano kukui uila liʻiliʻi, a me nā kahua ʻē aʻe.
Nā LED Keʻokeʻo: No nā kukui maʻamau, ʻoi aku ka makemake o nā kumu kukui keʻokeʻo. Ua hoʻomohala maikaʻi ʻia nā LED keʻokeʻo i ka makahiki 1998. Hana ʻia kēia mau LED ma ka hoʻopili ʻana i kahi pahu GaN a me yttrium alumini garnet (YAG) hui pū.
Hoʻopuka ka pahu GaN i ke kukui polū (λp=465nm, Wd=30nm). ʻO ka Ce3+-i loko o ka YAG phosphor, i hoʻopaʻa ʻia i nā wela kiʻekiʻe, e hoʻopuka i ke kukui melemele ke hoʻohauʻoli ʻia e kēia kukui polū, me ka lōʻihi hawewe o 550nm. Hoʻokomo ʻia ka substrate LED polū i loko o kahi kīʻaha-hoʻohāhā ʻano hoʻohālike a uhi ʻia me kahi ʻāpana lahilahi o ka resin i hui pū ʻia me YAG, ma kahi o 200-500nm mānoanoa. Hoʻopili ʻia ka ʻāpana o ke kukui uliuli i hoʻokuʻu ʻia e ka substrate LED e ka phosphor, ʻoiai ke koena o ke kukui uliuli e hui pū me ke kukui melemele i hoʻokuʻu ʻia e ka phosphor e hana i ke kukui keʻokeʻo. No nā LED keʻokeʻo InGaN / YAG, ma ka hoʻololi ʻana i ka haku mele YAG phosphor a me ka hoʻoponopono ʻana i ka mānoanoa o ka papa phosphor, hiki ke loaʻa nā kala like ʻole o ke kukui keʻokeʻo me nā mahana kala mai 3500-10000K.
Papa helu 1 i nā ʻano LED keʻokeʻo i loaʻa i kēia manawa a me kā lākou -mau kumu hoʻomāmā. Hōʻike ka papa ʻaina e hilinaʻi ana kekahi mau ʻano kumu kukui LED keʻokeʻo i ʻehā phosphor: ʻekolu kala kumu -rare-ʻulaʻula honua, ʻōmaʻomaʻo, a me nā phosphor uliuli-a me ka phosphor melemele me ka hale garnet. ʻEkolu -ʻeleʻele lōʻihi nalu, me ka hoʻohana ʻana i nā ʻāpana ultraviolet inorganic me nā phosphors RGB no ka hoʻopili ʻana i nā LED keʻokeʻo, e manaʻo ʻia e loaʻa kahi manawa kūʻai. Eia nō naʻe, liʻiliʻi ka nui o nā ʻāpana a me nā koi paʻa no kēia mau phosphors kala mua ʻekolu, a ke ʻimi nei kā lākou mau noi kikoʻī.
I kēia manawa, ʻo ka huahana mua loa i kūʻai ʻia ʻo ia he -chip LED polū hoʻokahi me ka YAG yellow phosphor, e loaʻa ana ka maikaʻi o ka mālamalama maikaʻi loa ma kahi o 25 lumens/watt. Lawe ʻia ʻo YAG mai Nichia Corporation o Iapana, kūʻai ʻia ma kahi o 2000 yuan/kg. ʻO ke ʻano ʻelua he mau LED keʻokeʻo i hoʻomohala ʻia e Sumitomo Electric Industries o Iapana e hoʻohana ana iā ZnSe ma ke ʻano he mea, akā me ka haʻahaʻa haʻahaʻa.
