Ultra‐Stable and Highly Efficient White Light Emitting Diodes through CsPbBr<sub>3</sub> Perovskite Nanocrystals−Silica Composite Phosphor Functionalized with Surface Phenyl Molecules (Small 7/2023)

Yoon, Soyeon; Seo, Minjun; Kim, In Soo; Lee, Kwangyeol; Woo, Kyoungja

doi:10.1002/smll.202370042

Cited by 1 publication

(1 citation statement)

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“…White light emitting diodes (WLEDs), as a new type of solid-state lighting source, have attracted a lot of attention because of their excellent luminescence properties, that is, long service life, high luminescence efficiency, low power consumption, and environmental-friendliness, and are regarded as excellent candidates to replace the current conventional fluorescent and incandescent lamps. [1][2][3][4][5][6][7][8][9][10] At present, white light is generated by a combination of a blue LED chip with a yellow-emitting phosphor from Y 3 Al 5 O 12 :Ce 3+ . [11][12][13] However, the white light formed by this combination produces a low color rendering index (CRI) and a high correlated color temperature (CCT).…”

Section: Introductionmentioning

confidence: 99%

A new yellowish‐green‐emitting phosphor: Eu²⁺‐doped Ba₃YAl₂O_7.5

Sun,

Wang,

Zhang

et al. 2024

Int J Applied Ceramic Tech

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A yellowish‐green emitting phosphor Ba3YAl2O7.5:Eu2+ was synthesized by a solid‐state method. The crystal structure, luminescence, concentration quenching, fluorescence decay, and thermal quenching properties were systematically investigated. Under blue light (440 nm) excitation, Ba3YAl2O7.5:Eu2+ phosphors exhibit a yellowish‐green emission peaking at 550 nm with a full width at half maximum ∼ 69 nm, and The Commission Internationale de l'Eclairage (CIE) coordinates of Ba3YAl2O7.5:Eu2+ are (0.4064, 0.5811). Structural analysis and Van Uitert equation along with fluorescence lifetime analysis reveal that Eu2+ ions occupy 6‐coordinated Y and 9‐coordinated Ba sites in Ba3YAl2O7.5, and therefore generate two emission sub‐bands at 582 and 548 nm. In addition, Ba3YAl2O7.5:Eu2+ phosphor remaining 43% photoluminescence emission intensity at 125°C with an activation energy of 0.372 eV. Utilizing the title phosphor (Ba3YAl2O7.5:3%Eu2+), commercial red (Ca,Sr)AlSiN3:Eu2+ (CSAlSi:Eu2+) phosphor, and InGaN‐based blue light emitting diode (LED) chip, a proof‐of‐concept warm white LEDs (WLEDs) with a color rendering index of 80.1, CIE chromaticity coordinates of (0.411, 0.381), luminous efficacy of ∼ 22.13 lm/W, and correlated color temperature of ∼ 3288 K is achieved. Thus, Eu2+ activated Ba3YAl2O7.5 phosphors have the potential application in WLEDs pumped by a blue LED chip for solid‐state lighting application.

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