A breakthrough in the luminescence performance of broadband near-infrared (NIR) emitting phosphors is central to their successful application in next-generation smart NIR light sources. Currently,due to the deficiency...A breakthrough in the luminescence performance of broadband near-infrared (NIR) emitting phosphors is central to their successful application in next-generation smart NIR light sources. Currently,due to the deficiency of phosphors that have both high blue light absorption efficiency (AE) and high NIR internal quantum efficiency (IQE),NIR phosphor-converted LEDs (pc-LEDs) still bear low external quantum efficiencies (EQE) (<40%). In this work,an effective ion substitution strategy,that is Nb^(5+) substitution for Ta^(5+),was used to improve the luminescence of GaTaO_(4) (GTO):0.02Cr^(3+) phosphor. Consequently,a series of GaTa_(1-y)Nb_(y)O_(4) (GTNO):0.02Cr^(3+) (y=0–1.0) solid solution phosphors achieved breakthroughs in the AE,IQE and EQE. Under 474 nm excitation,the AE,IQE and EQE of the GTNO:0.02Cr^(3+) (y=0) phosphor were 39.9%,75.4% and 30.1%,respectively. After the proper substitution of Nb^(5+),corresponding to GTNO:0.02Cr^(3+) (y=0.5),the three values were accordingly enhanced to 52.5%,94.0% and 49.4%,under 476 nm excitation. The ion substitution strategy gave significant breakthroughs in the luminescence efficiency of the NIR phosphors,which is an important guideline for the development of more efficient broadband NIR phosphors in the future.展开更多
基金supported in part by the National Natural Science Foundation of China(grant no.62127816)in part by the National Key R&D Program of China(grant No.2018YFB1801001)+3 种基金in part by the Guangdong Introducing Innovative and Enterpreneurial Teams of“The Pearl River Talent Recruitment Program”(grant no.2019ZT08X340)in part by the Research and Development Plan in Key Areas of Guangdong Province(grant no.2018B010114002)in part by the Science and Technology Program of Guangzhou,China(grant no.202002030091,202102080261)in part by the Guangzhou Key Laboratory of Low Dimensional Materials and Energy Storage Devices(grant no.201905010002).
文摘A breakthrough in the luminescence performance of broadband near-infrared (NIR) emitting phosphors is central to their successful application in next-generation smart NIR light sources. Currently,due to the deficiency of phosphors that have both high blue light absorption efficiency (AE) and high NIR internal quantum efficiency (IQE),NIR phosphor-converted LEDs (pc-LEDs) still bear low external quantum efficiencies (EQE) (<40%). In this work,an effective ion substitution strategy,that is Nb^(5+) substitution for Ta^(5+),was used to improve the luminescence of GaTaO_(4) (GTO):0.02Cr^(3+) phosphor. Consequently,a series of GaTa_(1-y)Nb_(y)O_(4) (GTNO):0.02Cr^(3+) (y=0–1.0) solid solution phosphors achieved breakthroughs in the AE,IQE and EQE. Under 474 nm excitation,the AE,IQE and EQE of the GTNO:0.02Cr^(3+) (y=0) phosphor were 39.9%,75.4% and 30.1%,respectively. After the proper substitution of Nb^(5+),corresponding to GTNO:0.02Cr^(3+) (y=0.5),the three values were accordingly enhanced to 52.5%,94.0% and 49.4%,under 476 nm excitation. The ion substitution strategy gave significant breakthroughs in the luminescence efficiency of the NIR phosphors,which is an important guideline for the development of more efficient broadband NIR phosphors in the future.
