Bright White‐Emitting Phosphors Ba 2 Gd(BO 3 ) 2 Cl: Dy 3+ /Dy 3+ ‐Tm 3+ for Hg‐Free Lamps and White LEDs Applications
Source abstract
Abstract
Spectroscopic properties of Ba 2 Gd( BO 3 ) 2 Cl: Dy 3+ and Ba 2 Gd( BO 3 ) 2 Cl: Dy 3+ , Tm 3+ under vacuum ultraviolet ( VUV ) and ultraviolet ( UV ) light excitations were investigated. Dy 3+ single‐doped Ba 2 Gd( BO 3 ) 2 Cl showed broad absorption band in the VUV region, and bright warm white light with chromaticity coordinates ( CIE ) of (0.340, 0.381) upon VUV excitation at 172 nm, demonstrating this phosphor's applicability in mercury free lamps. Upon direct excitation Tm 3+ from its 6 F 6 level to 1 D 2 level, the decrease of emission intensity and lifetime of Tm 3+ 1 D 2 – 3 F 4 emission with increasing concentration of Dy 3+ in Ba 2 Gd( BO 3 ) 2 Cl: Dy 3+ , Tm 3+ confirmed the occurrence of energy transfer from Tm 3+ to Dy 3+ . In addition, Ba 2 Gd( BO 3 ) 2 Cl: Dy 3+ , Tm 3+ could be efficiently excited by 358 nm UV light and its emission color could be tuned from blue to yellow by codoping Tm 3+ . When 1% Tm 3+ and 5% Dy 3+ were codoped in the Ba 2 Gd( BO 3 ) 2 Cl, intensive white‐emitting light with CIE of (0.352, 0.328) and correlated color temperature of 4589 K was achieved upon 358 nm excitation, revealing the potential application of Ba 2 Gd( BO 3 ) 2 Cl: Dy 3+ , Tm 3+ for white light‐emitting diodes ( LED s).
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Research context
OpenAlex topics: Luminescence Properties of Advanced Materials · Gas Sensing Nanomaterials and Sensors · Advanced Photocatalysis Techniques
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Key Laboratory of Design of Special Function Materials and Structures, Ministry of Education Lanzhou University Lanzhou 730000 China
Funding
Specialized Research Fund for the Doctoral Program of Higher Education
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