p-State Luminescence in CdSe Nanoplatelets: Role of Lateral Confinement and a Longitudinal Optical Phonon Bottleneck

被引：71

作者：

Achtstein, Alexander W. ^{[1
]}

Scott, Riccardo ^{[1
]}

Kickhoefel, Sebastian ^{[1
]}

Jagsch, Stefan T. ^{[2
]}

Christodoulou, Sotirios ^{[3
,4
]}

Bertrand, Guillaume H. V. ^{[4
]}

Prudnikau, Anatol V. ^{[5
]}

Antanovich, Artsiom ^{[5
]}

Artemyev, Mikhail ^{[5
]}

Moreels, Iwan ^{[4
]}

Schliwa, Andrei ^{[2
]}

Woggon, Ulrike ^{[1
]}

机构：

[1] Tech Univ Berlin, Inst Opt & Atom Phys, Str 17,Juni 135, D-10623 Berlin, Germany

[2] Tech Univ Berlin, Inst Solid State Phys, Str 17,Juni 135, D-10623 Berlin, Germany

[3] Univ Genoa, Dept Phys, Via Dodecaneso 33, IT-16146 Genoa, Italy

[4] Ist Italiano Tecnol, Via Morego 30, IT-16163 Genoa, Italy

[5] Belarusian State Univ, Inst Physicochem Problems, Minsk 220030, BELARUS

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 116卷 / 11期

关键词：

COLLOIDAL NANOPLATELETS; ZINCBLENDE CDSE; SEMICONDUCTORS; ABSORPTION;

D O I：

10.1103/PhysRevLett.116.116802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We evidence excited state emission from p states well below ground state saturation in CdSe nanoplatelets. Size-dependent exciton ground and excited state energies and population dynamics are determined by four independent methods: time-resolved PL, time-integrated PL, rate equation modeling, and Hartree renormalized k center dot p calculations-all in very good agreement. The ground state-excited state energy spacing strongly increases with the lateral platelet quantization. Depending on its detuning to the LO phonon energy, the PL decay of CdSe platelets is governed by a size tunable LO phonon bottleneck, related to the low exciton-phonon coupling, very large oscillator strength, and energy spacing of both states. This is, for instance, ideal to tune lasing properties. CdSe platelets are perfectly suited to control the exciton-phonon interaction by changing their lateral size while the optical transition energy is determined by their thickness.

引用

页数：5

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