Uphando olutsha lweqela leYunivesithi yaseWuhan: ukusebenza kakuhle kwe-Mini LED ebomvu kunyuke nge-30%

Kutshanje, iqela likaZhou Shengjun kwiYunivesithi yaseWuhan lenze umaleko omtsha we-Schottky-contact intrinsic current blocking layer (SCBL), onokuphucula ukusasazeka komsinga kummandla osebenzayo. Kwaye kuphuculwe ukusebenza kakuhle kokukhupha ukukhanya kwe-AlGaInP red. I-LED encinci(LEE).

Umzobo ongasentla ubonisa (a) ulwakhiwo lwesixhobo, kunye (b) inkqubo yokuvelisa esekwe kwisakhiwo esithe nkqo sesibane esibomvu se-AlGaInP I-Mini LED nge-SCBL. (c) i-SCBL kunye (d) isakhiwo esibomvu esisekwe kwi-AlGaInP esithe nkqoimakroskopuimifanekiso.

Inkokeli yophando uShengjun Zhou uthe iqela lisebenzise iipropati zoqhagamshelwano zeSchottky phakathi kwe-indium tin oxide (ITO) kunye ne-p-GaP, kunye neepropati zoqhagamshelwano ze-ohmic phakathi kwe-ITO kunye ne-p-GaP+ ukwakha i-SCBL, nto leyo ebonakaliswe yindlela yokudlulisa ubude.

UZhou Shengjun uthe i-SCBL inokunciphisa ngempumelelo ukuxinana komsinga ojikeleze i-p electrode kwaye ikhuthaze ukusasazeka komsinga ofanayo, ngaloo ndlela iphucula ukusebenza kakuhle kokukhupha ukukhanya kwe-AlGaInP red Mini LED. Ngenxa yokusasazeka komsinga okuphuculweyo kunye nokukhutshelwa kokukhanya, ii-Mini LED ezine-SCBL zibonisa ukusasazwa okufanayo kokukhanya okunamandla, amandla aphezulu okukhupha ukukhanya, kunye nokusebenza okuphezulu kwe-quantum yangaphandle (EQE).

I-AlGaInP ebomvu iMini LED isetyenziswa kakhulu njengenxalenye ebalulekileyo yombala opheleleyo iziboniso ngenxa yokukhanya kwayo okuphezulu, ukusetyenziswa kwamandla aphantsi kunye nobomi bayo obude.

Nangona kunjalo, ukuxinana kwamandla ombane ajikeleze i-p electrode kubangela ukusasazwa kwamandla ombane okungalinganiyo kwindawo esebenzayo. Ukongeza, ngenxa yokuba uninzi lwee-photon eziveliswa kwindawo esebenzayo zifunxwa okanye zibonakaliswa yi-opaque metal p electrode, ukusebenza kakuhle kokukhupha ukukhanya (LEE) kwe-AlgainP-based Mini LED kuphantsi.

Ukusombulula le ngxaki, abaphandi bazise i-SCBL ukuphucula ukusasazeka kwangoku kunye nokukhupha ukukhanya kwee-Mini leds ezisekwe kwi-AlgainP. Ngokusebenzisa unxibelelwano lwe-Schottky phakathi kwe-ITO kunye ne-P-gap, i-SCBL inokuthintela ukuxinana kwangoku okujikeleze i-p electrode. Umbane unyanzelwa ukuba ungene kwindawo esebenzayo ngokusebenzisa umaleko woqhagamshelwano we-P-GAP + ohmic ukuze kuthintelwe ukufunxwa kunye nokubonakaliswa kokukhanya yi-p electrode yesinyithi engabonakaliyo.

Iziphumo zibonise ukuba ukusebenza kakuhle kwe-quantum yangaphandle (i-EQE) ye-AlGaInP Mini LED esebenzisa i-SCBL inokwandiswa ukuya kuthi ga kwi-31.8% kumbane we-20mA xa kuthelekiswa ne-AlGaInP Mini LED engena-SCBL. Ke ngoko, itekhnoloji ye-SCBL kulindeleke ukuba isetyenziswe kwimveliso enkulu ye-AlgainP Red Mini LED esebenzayo kwixesha elizayo.

Kubalulekile ukuqaphela ukuba iqela leZhou Shengjun leYunivesithi yaseWuhan likhuphe iziphumo ezininzi zophando lwe-LED. Umzekelo, kwicandelo lee-LED ezinzulu ze-ultraviolet, iqela liqalise i-Algan-based ultra-thin tunnel junction (26 nm) kwi-deep ultraviolet LED, eyandisa ukusebenza kakuhle kokuguqulwa kwe-electro-optical kwe-deep ultraviolet LED nge-5.5%.

Kwicandelo leMini LED, iqela liphucule ukusebenza kweetships zeMini LED eziluhlaza okwesibhakabhaka nokuluhlaza ngokusebenzisa iFull-angle Distributed Bragg Reflector (DBR). Phantsi kwemeko yangoku ye-injection ye-10mA, amandla okukhupha ukukhanya kweMini LED eluhlaza okwesibhakabhaka nokuluhlaza asekelwe kwi-ITO/DBR anyuswa malunga ne-7.7% kunye ne-7.3%, ngokwahlukeneyo.