With the addition of Na^(+)and Bi^(3+) to the lead-free double perovskite Cs_(2)AgInCl_(6),high photoluminescence quantum yields(PLQYs)can be achieved,making Cs_(2)AgInCl_(6) more promising;however,it is still difficu...With the addition of Na^(+)and Bi^(3+) to the lead-free double perovskite Cs_(2)AgInCl_(6),high photoluminescence quantum yields(PLQYs)can be achieved,making Cs_(2)AgInCl_(6) more promising;however,it is still difficult to achieve blue-light-excited narrowing emission.In this study, Cs_(2−x)K_(x)Ag_(0.6)Na_(0.4)In_(0.8)Bi_(0.2)Cl_(6−x)Br_(x) was developed with K+and Br−,realizing blue-light-excited narrowing red photoluminescence under cryogenic temperatures.The transitional non-localized donor energy level was formed by KBr addition,changing the exciton excitation and transition process.With the increase in the x value, Cs_(2−x)K_(x)Ag_(0.6)Na_(0.4)In_(0.8)Bi_(0.2)Cl_(6−x)Br_(x) can be excited by blue light at 150 K and emit a narrowing red light.When 1:1 KBr was added,the full width at half maximum(FWHM)of Cs_(2−x)K_(x)Ag_(0.6)Na_(0.4)In_(0.8)Bi_(0.2)Cl_(6−x)Br_(x) red light emission was further narrowed to only 73 nm,when excited by 467 nm blue light at 10 K.This study will stimulate further research on lead-free double perovskites in the field of display technologies.展开更多
基金financial supported in part by the Tianjin Natural Science Foundation(No.17JCQNJC02300,18JCYBJC86200)National Natural Science Foundation of China(No.51702235,51871167,51971158)+1 种基金the National Key Foundation for Exploring Scientific Instrument of China(No.2014YQ120351)Developing Foundation of Tianjin Education Commission(2017ZD14).
文摘With the addition of Na^(+)and Bi^(3+) to the lead-free double perovskite Cs_(2)AgInCl_(6),high photoluminescence quantum yields(PLQYs)can be achieved,making Cs_(2)AgInCl_(6) more promising;however,it is still difficult to achieve blue-light-excited narrowing emission.In this study, Cs_(2−x)K_(x)Ag_(0.6)Na_(0.4)In_(0.8)Bi_(0.2)Cl_(6−x)Br_(x) was developed with K+and Br−,realizing blue-light-excited narrowing red photoluminescence under cryogenic temperatures.The transitional non-localized donor energy level was formed by KBr addition,changing the exciton excitation and transition process.With the increase in the x value, Cs_(2−x)K_(x)Ag_(0.6)Na_(0.4)In_(0.8)Bi_(0.2)Cl_(6−x)Br_(x) can be excited by blue light at 150 K and emit a narrowing red light.When 1:1 KBr was added,the full width at half maximum(FWHM)of Cs_(2−x)K_(x)Ag_(0.6)Na_(0.4)In_(0.8)Bi_(0.2)Cl_(6−x)Br_(x) red light emission was further narrowed to only 73 nm,when excited by 467 nm blue light at 10 K.This study will stimulate further research on lead-free double perovskites in the field of display technologies.
