Ultrahigh Green and Red Optical Gain Cross Sections from Solutions of Colloidal Quantum Well Heterostructures

被引：28

作者：

Delikanli, Savas ^{[1
,2
]}

Erdem, Onur ^{[1
]}

Isik, Furkan ^{[1
]}

Baruj, Hamed Dehghanpour ^{[1
]}

Shabani, Farzan ^{[1
]}

Yagci, Huseyin Bilge ^{[1
]}

Durmusoglu, Emek Goksu ^{[2
]}

Demir, Hilmi Volkan ^{[1
,2
]}

机构：

[1] Bilkent Univ, UNAM Inst Mat Sci & Nanotechnol, Dept Elect & Elect Engn, Dept Phys, TR-06800 Ankara, Turkey

[2] Nanyang Technol Univ, Luminous Ctr Excellence Semicond Lighting & Displ, Sch Elect & Elect Engn, Sch Phys & Mat Sci, Singapore 639798, Singapore

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2021年 / 12卷 / 09期

基金：

新加坡国家研究基金会;

关键词：

Semiconductor quantum dots - Cadmium compounds - Semiconductor quantum wells;

D O I：

10.1021/acs.jpclett.0c03836

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We demonstrate amplified spontaneous emission (ASE) in solution with ultralow thresholds of 30 mu J/cm(2) in red and of 44 mu J/cm(2) in green from engineered colloidal quantum well (CQW) heterostructures. For this purpose, CdSe/CdS core/crown CQWs, designed to hit the green region, and CdSe/CdS@CdxZn1-xS core/crown@gradient-alloyed shell CQWs, further tuned to reach the red region by shell alloying, were employed to achieve highperformance ASE in the visible range. The net modal gain of these CQWs reaches 530 cm(-1) for the green and 201 cm(-1) for the red, 2-3 orders of magnitude larger than those of colloidal quantum dots (QDs) in solution. To explain the root cause for ultrahigh gain coefficient in solution, we show for the first time that the gain cross sections of these CQWs is >= 3.3 x 10(-14) cm(2) in the green and >= 1.3 x 10(-14) cm(2) in the red, which are two orders of magnitude larger compared to those of CQDs.

引用

页码：2177 / 2182

页数：6

共 44 条

[1] Self-Assembly of CdSe Nanoplatelets into Giant Micrometer-Scale Needles Emitting Polarized Light [J].