Izimbangela Ze-LED's Heat Generation
Njengemithombo yokukhanya evamile, ama-semiconductor emitting diode (ama-LED) nawo akhiqiza ukushisa phakathi nokusebenza, kuye ngokusebenza kahle kokukhanya. Ngaphansi kwesenzo samandla kagesi asetshenzisiwe, imisebe yama-electron nezimbobo kuhlangana kabusha ukuze kukhiqizwe i-electroluminescence, futhi ukukhanya okukhazimulayo eduze nendawo yokuhlangana ye-PN kudinga ukudlula endaweni ephakathi kwesemiconductor nendawo yokupakisha ye-chip ngokwayo ukuze ifinyelele ngaphandle (umoya). Ukusebenza kahle komjovo wamanje ophelele, ukusebenza kahle kwe-radiation luminescence quantum, ukusebenza kahle kwe-chip yangaphandle yokukhipha ukukhanya, njll., okokugcina kuphela okungama-30-40% wamandla okufaka kumandla okukhanya, kanye nama-60-70% asele wamandla awo ikakhulukazi enzeka endaweni engeyona. uhlobo oluyinkimbinkimbi lwemisebe yokushisa kokudlidliza kwechashazi-matrix.
Ukwenyuka kwezinga lokushisa le-chip kuzothuthukisa inkimbinkimbi engasebenzisi imisebe, kwenze buthaka ukusebenza kahle okukhanyayo. Ngoba abantu bacabanga ukuthi ama-LED anamandla aphezulu awanakho ukushisa, empeleni akwenza. Ukushisa okuningi kubangela kalula izinkinga eziningi ngesikhathi sokusetshenziswa. Ngaphezu kwalokho, abantu abaningi abasebenzisa ama-LED amandla aphezulu okokuqala futhi abaqondi ukuthi bangaxazulula kanjani ngempumelelo izinkinga ezishisayo, okwenza ukwethembeka kokukhiqiza kube yinkinga enkulu. Ngakho-ke nansi eminye imibuzo okufanele sicabange ngayo: Ingabe ama-LED anakho ukushisa okukhiqiziwe? Ingakhiqiza ukushisa okungakanani? I-LED ikhiqiza ukushisa okungakanani?
Ngaphansi kwe-voltage eya phambili ye-LED, ama-electron athola amandla kumthombo wamandla. Ngaphansi kokushayela kwenkundla kagesi, inkambu kagesi ye-PN junction iyanqotshwa, futhi ukuguqulwa kusuka esifundeni esingu-N kuya esifundeni se-P kwenzeka. Lawa ma-electron aphinde ahlangane nezimbobo esifundeni esingu-P. Njengoba ama-electron amahhala akhukhuleka endaweni engu-P enamandla amakhulu kunama-electron e-valence esifundeni esingu-P, ama-electron abuyela esimweni samandla aphansi ngesikhathi sokuhlanganiswa kabusha, futhi amandla angaphezu kwamandla akhululwa ngendlela yama-photons. Ubude begagasi be-photon ekhishiwe buhlobene nomehluko wamandla Isb. Kungabonakala ukuthi indawo ekhipha ukukhanya ikakhulukazi iseduze nendawo yokuhlangana ye-PN, futhi ukukhishwa kokukhanya kuwumphumela wamandla akhishwe ukuhlanganiswa kabusha kwama-electron nezimbobo. Ku-semiconductor diode, ama-electron azobhekana nokuphikiswa phakathi nalo lonke uhambo ukusuka endaweni ye-semiconductor kuya endaweni ye-semiconductor. Ngokulula kusuka kumgomo, ukwakheka komzimba kwe-semiconductor diode kumane nje kususelwa kumgomo, inani lama-electron akhishwa ku-electrode engalungile kanye nama-electron abuyiselwe ku-electrode enhle ye-semiconductor diode ayalingana. Ama-diode avamile, lapho ukuphinda kuhlanganiswe kokubili kwe-electron-hole kwenzeka, ngenxa yesici somehluko wezinga lamandla Isb, i-photon spectrum ekhishiwe ayikho ebangeni elibonakalayo.
Endleleni ngaphakathi kwe-diode, ama-electron adla amandla ngenxa yokuba khona kokumelana. Amandla asetshenzisiwe ahambisana nemithetho eyisisekelo yezinto zikagesi:
P = I2 R = I2 (RN + + RP) + IVTH
Amanothi: I-RN ukumelana komzimba kwendawo engu-N
I-VTH iyi-voltage yokuvula ye-PN junction
I-RP ukumelana kwenqwaba yesifunda se-P
Ukushisa okukhiqizwa amandla asetshenzisiwe:
Q = Pt
Kuphi: t yisikhathi lapho i-diode inikwa amandla.
Empeleni, i-LED iseyi-semiconductor diode. Ngakho-ke, lapho i-LED isebenza ngendlela eya phambili, inqubo yayo yokusebenza ihambisana nencazelo engenhla. Amandla kagesi ewasebenzisayo yilawa:
P LED = U LED × I LED
Kuphi: I-U LED iyi-voltage eya phambili kuwo wonke umthombo wokukhanya we-LED
I-LED iyi-current egeleza nge-LED
Amandla kagesi asetshenzisiwe aguqulwa abe ukushisa futhi akhululwe:
Q＝P LED × t
Amanothi: t isikhathi sokusebenzisa amandla
Eqinisweni, amandla akhululwa lapho i-electron iphinda ihlangana nembobo esifundeni se-P ayinikezwa ngokuqondile amandla angaphandle, kodwa ngenxa yokuthi i-electron isendaweni ye-N, lapho ingekho insimu kagesi yangaphandle, izinga layo lamandla liphakeme. kunaleyo yesifunda se-P. Izinga le-electron ye-Valence liphakeme kuneSib. Uma ifika endaweni engu-P futhi iphinde ihlangane nezimbobo ukuze ibe ama-electron e-valence esifundeni esingu-P, izokhipha amandla amaningi. Ubukhulu be-Eg bunqunywa yizinto ngokwazo futhi azihlangene nenkambu kagesi yangaphandle. Iqhaza lokunikezwa kwamandla kwangaphandle ku-electron ukuwuphusha ukuze ihambe iqonde futhi inqobe indima ye-PN junction.
Inani lokushisa elikhiqizwa yi-LED alihlangene nokusebenza kahle kokukhanya; abukho ubuhlobo phakathi kwamaphesenti angakanani amandla kagesi akhiqiza ukukhanya, futhi iphesenti elisele lamandla kagesi likhiqiza ukushisa. Ngokuqonda imiqondo yokukhiqiza ukushisa, ukumelana nokushisa nokushisa okuhlanganayo kwama-LED anamandla amakhulu kanye nokutholwa kwamafomula etiyori kanye nezilinganiso zokumelana nokushisa, singakwazi ukutadisha umklamo wangempela wokupakisha, ukuhlola kanye nezicelo zomkhiqizo zama-LED anamandla amakhulu. Kumele kuqashelwe ukuthi ukuphathwa kokushisa kuyinkinga eyinhloko esigabeni samanje sokusebenza kahle okuphansi kokukhanya kwemikhiqizo ye-LED. Ukuthuthukisa ukusebenza kahle okukhanyayo ukuze kuncishiswe ukukhiqizwa kwamandla okushisa kungaphansi kwegedlela. Lokhu kudinga ukukhiqizwa kwama-chip, ukupakishwa kwe-LED nokuthuthukiswa komkhiqizo wohlelo lokusebenza. Inqubekelaphambili yezobuchwepheshe kuzo zonke izici.
