Mn2+doping enabled efficient high-color-rendering single-phase white-emitting lead halide perovskites

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: RESEARCH HIGHLIGHTS
• 页码范围: 97-99
• 页数: 3页
• 语种: 英文

摘要

The development of high-color-rendering phosphor-converted white light-emitting diodes(w-LEDs)is highly demanded for high-quality solid-state white lighting[1-4].In modern society,white-light sources with excellent color rendering index(CRI)exceeding 90 are required in some color-critical applications,for examples,art gallery,photography,cinematography,museum,jewelry shops and surgery[5,6].Although the near-UV-pumped w-LEDs fabricated with near-UV LED chips and RGB(red/green/blue)tricolor phosphors can offer a high-color-rendering white-light emission,but the output color balance is difficult to control and the absorption problem among tricolor phosphors leads to reduction of photoluminescence quantum yields(PLQYs)[7].Therefore,to avoid these issues,it is crucial to find an efficient near-UV-excitable single-phased white-emitting phosphor,which exhibits broad emission in the entire visible spectrum range from 400 to 700 nm.In view of this situation,some research groups made great efforts to develop single-phased white-light phosphors for near-UV-pumped w-LEDs,and some promising white emitters were discovered in,such as,K2Ca(PO4)F︰Eu2+(Ra = 87.6,R9 = 65)[8],K2BaCa(PO4)2_x(BO3)x︰Eu2+(Ra = 90.4,R9 = 93.8)[9],and Ca2(BO3)1-x(PO4)xCl:Eu2+(Ra = 83.4,R9 = 39.3)[10].However,these white-light phosphors are commonly based on rare-earth Eu2+ions,which are very expensive.The shortages in supply or increases in price for rare-earth elements have already been a glo-bal problem,which might lead to disastrous effects in the solid-state lighting industry in the future.Moreover,the preparation of these Eu2+doped phosphors requires complicate synthesis proce-dures including high-temperature and reducing atmosphere,thus causing remarkable increase in product cost.Therefore,the search for alternative rare-earth-free high-efficiency single-component white-light-emitting materials is very important and urgent.