Dy³⁺‐doped Y₃Al₅O₁₂ transparent ceramic for high efficiency ultraviolet excited single‐phase white‐emitting phosphor

Abstract

A kind of Dy‐doped yttrium aluminum garnet (YAG) transparent ceramic for ultraviolet excited single‐phase white light‐emitting phosphor was investigated, which has high‐quantum efficiency (45%). The temperature field of Dy:YAG transparent ceramic was calculated by steady‐state thermal simulation. Moreover, by combining with 365 nm light‐emitting diodes (LED) chip directly, the Commission Internationale de l’Éclairage coordinate (x = 0.33, y = 0.35) is close to the standard equal energy white light illumination. The Dy:YAG transparent ceramic, possessing of good optical and thermal properties, is promising for applications in high‐power LEDs devices.

Daylight-White-Emitting and Abnormal Thermal Antiquenching Phosphors Based on a Layered Host SrIn2(P2O7)2

“…15 In contrast, the single-component white phosphor with an UV LED chip is a preferred alternative to settle the drawback above, which possesses superior features including high color purity, CRI, and luminous efficiency. 16 Consequently, it is imperative in demand to seek novel UV excitation single-phase phosphors with remarkable properties, like tunable emission and high quantum efficiency (QE). 17,18 A phosphor generally is composed of an activator, a matrix, sometimes a sensitizer.…”

Dy3+‐doped Y2Zr2O7 highly transparent ceramics for ultraviolet excitable warm white light‐emitting applications

“…Especially, the light radiation assigned in the warm white region is highly desirable for humans because this illumination light source with a low correlated color temperature (CCT) light (CCT ≤ 4500 K or even CCT ≤ 3500 K) can help autonomic relax, provide a warm and comfortable atmosphere, and can even avoid some diseases 4–7 . Moreover, with the remarkable development of UV‐LED diodes, the realization of white light‐emitting phosphors under ultraviolet excitation has been well demonstrated and developed 8 . Moreover, Nakajima et al.…”

“…Benefited from the emission originating from the 4 F 9/2 → 6 H 13/2 transition of Dy 3+ centered at about 580 nm; thus, Dy 3+ ‐doped phosphor materials have emerged as an especially robust representative to obtain the effective warm white luminescence 4 . However, the conventional Dy‐based composite luminescence converters fabricated by embedding phosphor powders in organic binders with poor chemical, thermal, and optical stability, which limited their further development in high‐power, high‐brightness solid‐state lighting 4,8,10 . As an alternative, some Dy‐doped glass converters have been developed, but the poor physical and chemical stabilities of the glass–ceramics make them unsuitable to be served in some harsh cases 11,12 .…”

Crystallization kinetics of Al2O3-26mol%Y2O3 glass and full crystallized transparent Y3Al5O12-based nanoceramic

“…By using usual sintering techniques, however, elaboration of highly transparent ceramics with nanocrystalline is still a challenge due to rapid grain growth at high sintering temperature [11]. For instance, as-sintered Dy:YAG ceramics at 1780 ℃ for 8 h under 10 − 3 Pa vacuum condition were always found with ubiquitous tens micrometer grains even using ultrafine raw powders of Al 2 O 3 (200 nm) and Y 2 O 3 , Dy 2 O 3 (80 nm) [12].…”