CH3NH3Pb1-xCoxBr3-2xCl2x Perovskite Quantum Dots for Wide-Color Backlighting

被引:20
作者
Singh, Rajan Kumar [2 ,3 ]
Sharma, Pushkal [1 ]
Kumar, Ranveer [2 ]
Som, Sudipta [3 ]
Dutta, Somrita [4 ]
Jain, Neha [2 ]
Chaurasiya, Rajneesh [3 ,5 ]
Meena, Mohan Lal [3 ]
Ho, Jian-Syun [6 ]
Dai, Shu-Wen [6 ]
Singh, Jai [2 ]
Lu, Chung-Hsin [3 ,7 ,8 ]
Lin, Hao-Wu [6 ]
机构
[1] MIT, Dept Chem Engn, Cambridge, MA 02139 USA
[2] Dr Harisingh Gour Cent Univ, Dept Phys, Sagar 470003, Madhya Pradesh, India
[3] Natl Taiwan Univ, Dept Chem Engn, Taipei 10617, Taiwan
[4] Natl Chiao Tung Univ, Dept Appl Chem, Hsinchu 30010, Taiwan
[5] Indian Inst Technol, Dept Phys, Jodhpur 342037, Rajasthan, India
[6] Natl Tsing Hua Univ, Dept Mat Sci & Engn, Hsinchu 300045, Taiwan
[7] Natl Taiwan Univ Sci & Technol, Dept Chem Engn, Taipei 106335, Taiwan
[8] Adv Res Ctr Green Mat Sci & Technol, Taipei 10617, Taiwan
关键词
lead deficient hybrid perovskite; stable quantum dot; high PLQY; color gamut; backlight; LIGHT-EMITTING-DIODES; HALIDE PEROVSKITES; PHOTOLUMINESCENCE; NANOCRYSTALS; EFFICIENT; STABILITY; GAMUT; SIZE;
D O I
10.1021/acsanm.0c03019
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
In recent years, perovskite quantum dots (PQDs) with the incorporation of transition-metal ions for reducing toxicity and enhancing stability have been in a research hotspot. However, the PQDs containing transition-metal ions are quite unstable and display low photoluminescence quantum yields (PLQYs), owing to the existence of defects. Herein, we have endeavored to introduce simultaneous cation and anion exchange with cobalt and chloride ions into the host CH3NH3Pb1-xCoxBr3-2xCI2x PQDs followed by matrix encapsulation via poly(methyl methacrylate) (PMMA) as a favorable approach to stabilize PQDs with improved PLQY. We have utilized cobalt chloride as the precursor for doping ions. The emission wavelength can be regulated from green to cyan color with the increase in doping concentration without negotiating on color quality, which is believed to be the modification of band gap and corresponding electron density estimated from the density functional theory. A high PLQY of 95% is observed even after the incorporation of cobalt and chloride ions into host PQDs. We demonstrate white light-emitting diode (LED) prototypes for backlight applications using a PQDs/PMMA composite on a blue LED chip, which exhibits excellent stability toward an ambient and robust atmosphere and provides a wide-color gamut of 124% of the NTSC standard. This research paves a way for the research community to synthesize highly efficient, color-tunable PQDs for wide-color backlighting applications.
引用
收藏
页码:717 / 728
页数:12
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