Superhigh
brightness, reliability, and modularization are three key features
of state-of-the-art high-brightness solid state lighting, such as
high-power white light-emitting diodes (white LEDs) and white laser
diodes (white LDs). However, these features are inevitably limited
by the organic resin packing material, as a crucial component of the
white lighting device, because of its unstable property at high temperature
and low thermal conductivity. Here, we report a robust light convertor
that can simultaneously play key roles as a phosphor and an alternative
encapsulating material via phosphor-in-glass (PiG) engineering. We
employed a combination of powder X-ray diffraction, scanning electron
microscope, energy dispersive spectrometer (EDS), EDS mapping, confocal
laser scanning microscope, cathodoluminescence mapping, in conjunction
with micro-PL system with a point-by-point scanning mode to study
the detailed structure of PiG samples. This Y3Al5O12:Ce3+-based PiG exhibits a high external
quantum efficiency of ∼60%, a high thermal conductivity of
∼0.59 W/mK, exceptional thermal stability, and excellent moisture
resistance. By combining the as-synthesized PiG with high-power blue
chip-on-board, a high luminous efficacy (92 lm/W) modular white LEDs
with a luminous flux up to 1076 lm and a high color rendering modular
warm white LEDs (Ra = 90.3 and CCT = 3585 K) are achieved. Moreover,
a modular white LDs with a higher luminous efficacy (110 lm/W) is
also achieved through blue LDs pumping. The results demonstrate that
this easy-fabrication, low-cost, and long-term reliable high-brightness
modular white LEDs or white LDs is expected to be a promising candidate
for next-generation illumination.
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