Enhancement of bandgap emission of Pt-capped MgZnO films: important role of light extraction versus exciton-plasmon coupling.
We present on a systematic study of the contribution of surface plasmon (SP) coupling and light extraction toward emission enhancement of Platinum (Pt) nano-patterns capped MgZnO films. Time resolved Photoluminescence (PL) results indicate that the Pt coating can greatly reduces the non-radiative recombination rate by passivation of surface states, making the decay slow down. Temperature dependence of the integrated photoluminescence intensity reveals that the Pt nano-patterns can offer a large amount of light transfer and scattering, which enormously increase the light extraction efficiency up to 3.8-fold. These results indicate that the increased light extraction efficiency caused by surface modification via Pt coating rather than SP coupling plays a dominant role in increasing bandgap emission of MgZnO film.
Department of Materials Science and Engineering, National University of Singapore, Singapore 117576, Singapore.
W F
WF
Yang
Y N
YN
Xie
R Y
RY
Liao
J
J
Sun
Z Y
ZY
Wu
L M
LM
Wong
S J
SJ
Wang
C F
CF
Wang
Alex Y S
AY
Lee
H
H
Gong
D000327:Adsorption; D008027:Light; D008277:Magnesium Oxide / Q000737:chemistry*; D008422:Materials Testing; D008567:Membranes, Artificial; D010984:Platinum / Q000737:chemistry*; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000379:methods*; D015034:Zinc Oxide / Q000737:chemistry*
D008567:Membranes, Artificial; D008277:Magnesium Oxide; D010984:Platinum; D015034:Zinc Oxide