The Effect of Temperature and Dot Size on the Spectral Properties of Colloidal InP/ZnS Core-Shell Quantum Dots

被引：135
|
作者：
Narayanaswamy, Arun [1 ]
Feiner, L. F. [1 ]
Meijerink, A. [2 ]
van der Zaag, P. J. [1 ]
机构：
[1] Philips Res Labs, NL-5656 AE Eindhoven, Netherlands
[2] Univ Utrecht, Debye Inst, NL-3508 TA Utrecht, Netherlands
来源：
ACS NANO | 2009年 / 3卷 / 09期
关键词：
quantum dots; InP/ZnS; photoluminescence; temperature dependence; dephasing; size dependence; finite-size scaling; HIGH-QUALITY INP; DEPENDENT PHOTOLUMINESCENCE; RAPID SYNTHESIS; NANOCRYSTALS; EMISSION; ASSIGNMENT; ABSORPTION; EXCITON; GAP;
D O I：
10.1021/nn9004507
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Visual color changes between 300 and 510 K were observed in the photoluminescence (PL) of colloidal InP/ZnS core-shell nanocrystals. A subsequent study of PL spectra in the range 2-510 K and fitting the temperature dependent line shift and line width to theoretical models show that the dominant (dephasing) interaction is due to scattering by acoustic phonons of about 23 meV. Low temperature photoluminescence excitation measurements show that the excitonic band gap depends approximately inversely linearly on the quantum dot size of, which is distinctly weaker than the dependence predicted by current theories.
引用
收藏
页码：2539 / 2546
页数：8
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