Catalysis

Phase (matter)

Engineering

Materials science

Ceramic

Dopant

Nanocomposite

Biochemistry

Photoluminescence

Chemical engineering

Photon upconversion

Laser

Physics

Nanotechnology

Organic chemistry

Crystallization

Optics

Doping

Luminescence

Composite material

Chemistry

Aluminosilicate

Hexagonal phase

Optoelectronics

Laser & Photonics Review

Yb/Er doped hexagonal β‐NaLnF 4 (Ln = Gd, Y, Lu) are regarded as the most efficient green upconversion (UC) materials. Unfortunately, β‐NaLnF 4 is quite difficult to grow as monocrystal owing to cubic‐to‐hexagonal phase transition during cooling. As an alternative, herein a nanocrystallization controllable strategy to synthesize monodisperse whole‐family β‐NaLnF 4 (from NaLaF 4 to NaLuF 4 ) embedded bulky glass ceramics is reported. A series of structural and spectroscopic characterizations indicate that Na content and Al/Si ratio are the most important factors to determine phase‐selective NaLnF 4 crystallization in the aluminosilicate oxyfluoride glasses. Impressively, such nanocomposites are evidenced to be ideal hosts for upconversion luminescence of Yb 3+ /Er 3+ dopants and as the proof‐of‐concept experiments, their applications in a random laser and incoherent LED‐excitable upconverting device as emitting media are demonstrated. It is expected that this study will provide a deep understanding for controllable crystallization in glass and extend the practical applications of glass ceramics in optoelectronic fields.

Phase‐Selective Nanocrystallization of NaLnF<sub>4</sub> in Aluminosilicate Glass for Random Laser and 940 nm LED‐Excitable Upconverted Luminescence

Phase‐Selective Nanocrystallization of NaLnF4 in Aluminosilicate Glass for Random Laser and 940 nm LED‐Excitable Upconverted Luminescence

Phase‐Selective Nanocrystallization of NaLnF₄ in Aluminosilicate Glass for Random Laser and 940 nm LED‐Excitable Upconverted Luminescence