Monolithic translucent BaMgAl10O17:Eu2+ phosphors for laser-driven solid state lighting

Abstract

With high power light emitting diodes and laser diodes being explored for white light generation and visible light communication, thermally robust encapsulation schemes for color-converting inorganic phosphors are essential. In the current work, the canonical blue-emitting phosphor, high purity Eu-doped BaMgAl10O17, has been prepared using microwave-assisted heating (25 min) and densified into translucent ceramic phosphor monoliths using spark plasma sintering (30 min). The resulting translucent ceramic monoliths convert UV laser light to blue light with the same efficiency as the starting powder and provide superior thermal management in comparison with silicone encapsulation.

Color Conversion Materials for High‐Brightness Laser‐Driven Solid‐State Lighting

“…Cozzan et al. prepared thermally robust BaMgAl 10 O 17 :Eu ceramics for high‐power laser‐driven applications . High‐purity BaMgAl 10 O 17 :Eu powder was synthesized first (Figure b), and then sintered into stand‐alone and robust ceramics by spark plasma sintering (SPS).…”

“…The thermograph images of g) the ceramic and h) the PiS under laser irradiation. Reproduced with permission . Copyright 2016, AIP publishing.…”

A Thermally Robust La3Si6N11:Ce‐in‐Glass Film for High‐Brightness Blue‐Laser‐Driven Solid State Lighting

“…Cozzan et al. fabricated a thermally robust BaMgAl 10 O 17 :Eu ceramic as a blue‐emitting color converter for ultraviolet (UV) LD‐driven lighting . Zhang et al.…”

Conversionless efficient and broadband laser light diffusers for high brightness illumination applications

“…Both these loss mechanisms scale with temperature 10 (e.g., as a result of illumination) and therefore phosphor luminescence suffers from saturation 10 , aging 11 , and thermal quenching 10 , limiting the irradiance tõ 5 kW cm −2 and thus the overall light output. Even though new concepts such as glass encapsulation 12,13 , phosphor monoliths 14 , or composite ceramic phosphors [15][16][17] can increase the irradiance level up to~10-20 kW cm −2 , the true potential of lasers for highbrightness lighting applications, with possible light outputs of several MW cm −2 , still remains unemployed.…”