Dual‐Shelled RbLi(Li3SiO4)2:Eu2+@Al2O3@ODTMS Phosphor as a Stable Green Emitter for High‐Power LED Backlights. Issue 31 (20th May 2020)

• Record Type: Journal Article
• Authors: Zhao, Ming; Cao, Kun; Liu, Mengjia; Zhang, Jing; Chen, Rong; Zhang, Qinyuan; Xia, Zhiguo
• Is Part Of: Angewandte Chemie international edition. Volume 59:Issue 31(2020)
• Page Start: 12938
• Page End: 12943
• Publication Date: 2020-05-20
• Subjects: ALD -- dual-shell -- hydrophobic surfaces -- LED backlights -- phosphors; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202003150
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: The stability of luminescent materials is a key factor for the practical application in white light‐emitting diodes (LEDs). Poor chemical stability of narrow‐band green‐emitting RbLi(Li3 SiO4 )2 :Eu 2+ (RLSO:Eu 2+ ) phosphor hinders their further commercialization even if they have excellent stability against thermal quenching. Herein, we propose an efficient protection scheme by combining the surface coating of amorphous Al2 O3 and hydrophobic modification by octadecyltrimethoxysilane (ODTMS) to construct the moisture‐resistant dual‐shelled RLSO:Eu 2+ @Al2 O3 @ODTMS composite. The growth mechanisms of both the Al2 O3 inorganic layer and the silane organic layer on the phosphor surface are investigated. The results remarkably improve the water‐stability of this narrow‐band green emitter. The evaluation of the white LED by employing this composite as the green component demonstrates that RLSO:Eu 2+ @Al2 O3 @ODTMS is a promising candidate for the high‐performance display backlights, and this dual‐shelled strategy provides an alternative method to improve the moisture‐resistant property of humidity‐sensitive phosphors. Abstract : Stable narrow‐band green emitter : Dual‐shelled moisture‐resistant RbLi(Li3 SiO4 )2 :Eu 2+ @Al2 O3 @ODTMS is prepared in two steps. Atomic layer deposition (ALD) coats alumina on the surface of RbLi(Li3 SiO4 )2 :Eu 2+ . Then the surface is modified with ODTMS to make it hydrophobic giving a composite phosphor with good moisture stability, which is crucial for commercial LED applications.