Achievement of an ultra-broadband deep red phosphor K3Ca0.3Y0.7Si2O7:Eu2+ (phase 1) for phytochrome matching plant-lighting
The market demand for environmentally controlled agricultural indoor lighting is gradually increasing due to environmental pollution and drastic changes in the natural climate. Generally, matrix K 3 YSi 2 O 7 (phase 1) is difficult to synthesize compared to K 3 YSi 2 O 7 (phase 2), which has been illustrated by theoretical calculations. In this paper, large quantities of pure phase K 3 YSi 2 O 7 (phase 1) matrix were obtained by the substitution engineering strategy (Ca 2+ →Y 3+ ). Subsequently, Eu 2+ was doped to obtain a thermally stable ultra-wideband deep red light-emitting phosphor with an emission band centered at 721 nm and a full width at half maximum of 186 nm under 450 nm light excitation. It is noteworthy that compared with K 3 YSi 2 O 7 :Eu (phase 2), K 3 Ca 0.3 Y 0.7 Si 2 O 7 :Eu 2+ (phase 1) is superior in terms of emission wavelength, full width at half maximum, and thermal stability. Furthermore, the spectrum resemblance between its emission spectrum and the photosensitive pigment P fr was calculated to be 97.5%, which set the stage for subsequent plant lighting applications. Finally, light-emitting diode devices were prepared using K 3 Ca 0.3 Y 0.7 Si 2 O 7 :Eu 2+ phosphor for plant lighting experiments, and plants grown under deep red light emitting diode light show more luxuriant growth. The results show that the phosphor K 3 Ca 0.3 Y 0.7 Si 2 O 7 :Eu 2+ has promising applications in indoor plant culture. Meanwhile, the successful implementation of ion substitution engineering also provides a new strategy for transitions in host systems.
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