Dopant Diffusion Equilibrium Overcoming Impurity Loss of Doped QDs for Multimode Anti-Counterfeiting and Encryption
Dopant Diffusion Equilibrium Overcoming Impurity Loss of Doped QDs for Multimode Anti-Counterfeiting and Encryption
复制标题
掺杂扩散平衡克服掺杂量子点的杂质损失，用于多模式防伪和加密
DOI：
10.1002/adfm.202100286
复制
发表时间：
2021-04-15
影响因子：
19
通讯作者：
Zhang, Jiatao
中科院分区：
文献类型：
--
作者：
Bai, Bing;Xu, Meng;Zhang, Jiatao
Cu+掺杂剂的高离子扩散率在高温下加速量子点（QD）中的外扩散。这种自净化引起掺杂剂光致发光（PL）强度的急剧下降。在此，通过在外延生长过程中引入额外的Cu+来开发掺杂剂扩散平衡策略。通过防止掺杂Cu+的损失，成功地抑制了掺杂PL的降低和带边PL强度的增加。Cu掺杂的CdSe@CdS量子点的可见光和不可见近红外（NIR）PL带的共存证明了其新颖的多模防伪/加密潜力。通过分别使用具有可见和不可见NIR发射的本征和掺杂的QD“油墨”的组合印刷，大尺寸图案、文本和数字可以实现可见-不可见PL协同机密信息的多模防伪和加密。
High ion diffusivity of Cu+ dopants accelerates outdiffusion in quantum dots (QDs) at high temperatures. This kind of self-purification gives rise to a sharp decrease in dopant photoluminescence (PL) intensity. Herein, a dopant diffusion equilibrium strategy is developed by introducing extra Cu+ in the epitaxial growth process. By preventing the loss of dopant Cu+, both the decrease of dopant PL and increase of band-edge PL intensity are successfully suppressed. The coexistence of visible and invisible near-infrared (NIR) PL bands for Cu-doped CdSe@CdS QDs demonstrates their novel multimode anti-counterfeiting/encryption potential. Via printing by combined using of intrinsic and doped QD "inks" with visible and invisible NIR emissions, respectively, the bulk-sized patterns, texts, and numerals can achieve visible-invisible PL synergetic confidential information multimode anti-counterfeiting and encryption.