Composite Color Converters Based on Tb₃Al₅O₁₂:Ce Single‐Crystalline Films and Y₃Al₅O₁₂:Ce Crystal Substrates

Abstract

The development of a novel composite phosphor converter based on singlecrystalline films of Tb 3 Al 5 O 12 :Ce garnet and Y 3 Al 5 O 12 :Ce single-crystal substrate is reported. The liquid phase epitaxy growth method is chosen for the fabrication of the Tb 3 Al 5 O 12 :Ce/Y 3 Al 5 O 12 :Ce epitaxial structures with excellent photoconversion properties for application in white light-emitting diodes (LEDs). The influence of Ce 3þ concentration and thickness of Y 3 Al 5 O 12 :Ce substrate as well as the thickness of Tb 3 Al 5 O 12 :Ce films on the photoconversion properties is investigated for the construction of warm white LEDs prototypes based on the developed composite phosphor converters.

Inorganic remote glass film based on yellowish‐green (Y, Ba)3(Al, Si)5O12:Ce garnet phosphor for warm white LEDs

“…In this work, yellow–green phosphors with garnet structure were prepared by co‐ion substitution and integrated into PiG films by co‐sintering at low temperatures. The color rendering quality of warm‐white‐light devices is improved by making up for blue and yellow depressions 21–23 . We used Ba 2+ –Si 4+ cations to replace dodecahedral and tetrahedral sites in the garnet structure.…”

“…The color rendering quality of warm-white-light devices is improved by making up for blue and yellow depressions. [21][22][23] We used Ba 2+ -Si 4+ cations to replace dodecahedral and tetrahedral sites in the garnet structure. Furthermore, SiO 2 -BaO-Al 2 O 3 -ZnO-Na 2 O glass powder was chosen to synthesize YAG-based PiG.…”

Novel composite color converters based on Tb1.5Gd1.5Al5O12:Ce single crystalline films and Y3Al5O12:Ce crystal substrates

“…28 The next stage of our activity is connected with the development of composite color converters based on the epitaxial structures of garnet compounds. 29 The creation of composite color converters based on the film-crystal epitaxial structures suggests some additional tuning parameters, originating from the YAG:Ce single crystal (SC) substrate: i) Ce 3+ doping concentration in the substrate and ii) thickness of the YAG:Ce crystal substrate. This approach was first applied for the development of composite color converters based on TAG:Ce single crystalline film and a YAG:Ce single crystal substrate.…”

“…This approach was first applied for the development of composite color converters based on TAG:Ce single crystalline film and a YAG:Ce single crystal substrate. 29 The following stage in developing the composite color converters is connected with the application of the SCF converters based on the mixed Tb 3+ and Gd 3+ containing garnet compounds. 30,31 Namely, the combination of the emission coming from Ce 3+ doped Tb 3−x Gd x Al 5 O 12 SCFs and the YAG:Ce crystal part of such a composite color converter under blue or UV LED excitation allows obtaining a wide spectrum of WLEDs similar to the spectrum of natural white light with enhanced luminous efficacy in comparison with standard photoconverters.…”

“…This approach was first applied for the development of composite color converters based on TAG:Ce single crystalline film and a YAG:Ce single crystal substrate. 29…”