Photoluminescence from quasi-type-II spherical CdSe-CdS core-shell quantum dots

QC 20130205
Spherical CdSe-CdS core-shell quantum dots (QDs) are found to be flexible in the transition between the type-I regime and the type-II regime with different core/shell dimensions. The quasi-type-II feature of the colloidal dots is confirmed with time-resolved photoluminescence (PL) measurements. Two recombination paths of the excitons with significantly different decay rates are observed and analyzed. The spherical CdSe-CdS core-shell QDs are numerically simulated to investigate the carrier separation. A relatively long radiative lifetime and high degree of spatial carrier separation provide good potential to achieve lasing under continuous-wave excitation. Amplified spontaneous emission at room temperature is detected from the QDs embedded in the polymer matrix. It is shown that a larger shell thickness results in a lower pumping threshold, while a smaller shell thickness leads to higher PL efficiency.

Sugunan, AbhilashKTH,Funktionella material, FNM(Swepub:kth)u18clew1 (författare)
Hu, JunKTH,Optik(Swepub:kth)u13j2cbv (författare)
Zhou, SichengKTH,Optik(Swepub:kth)u16fb1lm (författare)
Li, ShanghuaKTH,Funktionella material, FNM(Swepub:kth)u1jdsxsm (författare)
Popov, SergeiKTH,Optik(Swepub:kth)u1fs8je2 (författare)
Toprak, Muhammet S.KTH,Funktionella material, FNM(Swepub:kth)u1u3m5a2 (författare)
Friberg, Ari T.KTH,Optik(Swepub:kth)u11nn6uu (författare)
Muhammed, MamounKTH,Funktionella material, FNM(Swepub:kth)u1m5r8td (författare)
KTHOptik (creator_code:org_t)

Av författaren/redakt...: Dong, Lin; Sugunan, Abhilas ...; Hu, Jun; Zhou, Sicheng; Li, Shanghua; Popov, Sergei; visa fler...; Toprak, Muhammet ...; Friberg, Ari T.; Muhammed, Mamoun; visa färre...

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