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Highly Efficient Green Zn-Ag-In-S/Zn-In-S/ZnS QDs by a Strong Exothermic Reaction for Down-Converted Green and Tripackage White LEDs

机译:高效的绿色Zn-Ag-In-S / Zn-In-S / ZnS量子点通过强放热反应实现下转换的绿色和三封装白光LED

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摘要

Highly efficient bright green-emitting Zn-Ag-In-S (ZAIS)/Zn-In-S (ZIS)/ZnS alloy core/inner-shell/shell quantum dots (QDs) are synthesized using a multistep hot injection method with a highly concentrated zinc acetate dihydrate precursor. ZAIS/ZIS/ZnS QD growth is realized via five sequential steps: a core growth process, a two-step alloying-shelling process, and a two-step shelling process. To enhance the photoluminescence quantum yield (PLQY), a ZIS inner-shell is synthesized and added with a band gap located between the ZAIS alloy-core and ZnS shell using a strong exothermic reaction. The synthesized ZAIS/ZIS/ZnS QDs shows a high PLQY of 87% with peak wavelength of 501 nm. Tripackage white down-converted light-emitting diodes (DC-LEDs) are realized using an InGaN blue (B) LED, a green (G) ZAIS/ZIS/ZS QD-based DC-LED, and a red (R) Zn-Cu-In-S/ZnS QD-based DC-LED with correlated color temperature from 2700 to 10 000 K. The red, green, and blue tripackage white DC-LEDs exhibit high luminous efficacy of 72 lm W-1 and excellent color qualities (color rendering index (CRI, R-a) = 95 and the special CRI for red (R-9) = 93) at 2700 K.
机译:使用多步热注入法合成了高效发射绿光的Zn-Ag-In-S(ZAIS)/ Zn-In-S(ZIS)/ ZnS合金核/内壳/壳量子点(QD)。高浓度醋酸锌二水合物前体。 ZAIS / ZIS / ZnS QD的生长通过五个连续步骤实现:核心生长过程,两步合金化脱壳过程和两步脱壳过程。为了提高光致发光量子产率(PLQY),合成了ZIS内壳,并使用强放热反应在ZAIS合金核和ZnS壳之间添加了带隙。合成的ZAIS / ZIS / ZnS QD显示出87%的高PLQY,峰值波长为501 nm。 Tripackage白色下转换发光二极管(DC-LED)使用InGaN蓝色(B)LED,绿色(G)ZAIS / ZIS / ZS QD基DC-LED和红色(R)Zn-实现基于Cu-In-S / ZnS QD的DC-LED,相关色温从2700到10,000K。红色,绿色和蓝色三封装白色DC-LED表现出72 lm W-1的高发光效率和出色的色彩质量(显色指数(CRI,Ra)= 95,红色的特殊CRI(R-9)= 93)在2700 K下。

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