Dopant and excitation wavelength dependent color tunability in Dy3+ and Eu3+ doped CaBi2B2O7 phosphors for NUV warm white LEDs
Source abstract
Abstract
Abstract Dy3+ was introduced into CaBi2B2O7 by high temperature solid state reactions and it was proved to locate at the Bi3+ site by powder X-ray diffraction. Dy3+ emits a bluish white light efficiently both under 349 and 388 nm excitation, and the later one is important to the application for near ultra violet (NUV) WLEDs. Eu3+ was co-doped to tune the emitting color to warm white. Benefitting from the Dy3+ to Eu3+ energy transfer, the natural white emission with CIE coordinate of (0.34, 0.36) and CCT of 5095 K was achieved for Ca(Bi0.88Dy0.05Eu0.07)2B2O7 under the 349 nm excitation. Importantly, both the warm-white light of 3248 K (λex =380 nm) and natural white of 5200 K (λex =386 nm) can be obtained by varying the excitation wavelength for Ca(Bi0.92Dy0.05Eu0.03)2B2O7. These preliminary results suggest the potential of Dy3+ and Eu3+ co-doped CaBi2B2O7 in the application for NUV warm white LEDs.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Luminescence Properties of Advanced Materials · Glass properties and applications · Solid State Laser Technologies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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