Enhanced emission directivity from asymmetrically strained colloidal quantum dots.
Enhanced emission directivity from asymmetrically strained colloidal quantum dots.
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不对称应变胶体量子点增强发射方向性
DOI：
10.1126/sciadv.abl8219
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发表时间：
2022-02-25
期刊：
影响因子：
13.6
通讯作者：
Du J
中科院分区：
文献类型：
--
作者：
Song Y;Liu R;Wang Z;Xu H;Ma Y;Fan F;Voznyy O;Du J
目前最先进的量子点发光二极管已经达到接近统一的内部量子效率。外量子效率的进一步提高需要更有效的光子外耦合。提高光子发射的方向性被认为是最可行的方法。在这里，我们报告了改进的胶体量子点薄膜的发射方向性。通过生长非对称压缩壳，我们能够提升它们的带边态简并，这导致具有面内偶极矩的激子的压倒性种群，如高效光子外耦合所期望的。后焦平面成像法测得的面内偶极比例为88%，明显高于传统流体静力应变胶体量子点的70%。增强的发射方向性为显着提高外量子效率开辟了道路。
Current state-of-the-art quantum dot light-emitting diodes have reached close to unity internal quantum efficiency. Further improvement in external quantum efficiency requires more efficient photon out-coupling. Improving the directivity of the photon emission is considered to be the most feasible approach. Here, we report improved emission directivity from colloidal quantum dot films. By growing an asymmetric compressive shell, we are able to lift their band-edge state degeneracy, which leads to an overwhelming population of exciton with in-plane dipole moment, as desired for high-efficiency photon out-coupling. The in-plane dipole proportion determined by back-focal plane imaging method is 88%, remarkably higher than 70% obtained from conventional hydrostatically strained colloidal quantum dots. Enhanced emission directivity obtained here opens a path to increasing the external quantum efficiencies notably.
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影响因子：
16.6
作者：
Christodoulou S;Rajadell F;Casu A;Vaccaro G;Grim JQ;Genovese A;Manna L;Climente JI;Meinardi F;Rainò G;Stöferle T;Mahrt RF;Planelles J;Brovelli S;Moreels I
通讯作者：
Moreels I
DOI：
10.1002/advs.202003559
发表时间：
2021-03
期刊：
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
影响因子：
--
作者：
Cho C;Greenham NC
通讯作者：
Greenham NC
影响因子：
10.8
作者：
Giovanella, Umberto;Pasini, Mariacecilia;Brovelli, Sergio
通讯作者：
Brovelli, Sergio
影响因子：
8.6
作者：
Kim, Whi Dong;Kim, Dahin;Lee, Doh C.
通讯作者：
Lee, Doh C.
影响因子：
35
作者：
Mashford, Benjamin S.;Stevenson, Matthew;Kazlas, Peter T.
通讯作者：
Kazlas, Peter T.