Full-Spectrum White Light-Emitting Diodes Enabled by an Efficient Broadband Green-Emitting CaY2ZrScAl3O12:Ce3+ Garnet Phosphor

• DOI: 10.1021/acsami.1c23286
• Publication Date: 2022-01-25T11:29:07Z
• Authors: Lina Cao; Wei Li; Balaji Devakumar; Nan Ma; Xiaoyong Huang; Adam F. Lee
• Keywords: Color temperature; Color rendering index; Quantum Efficiency

Phosphor-containing white light-emitting diodes (LEDs) with low color-correlated temperatures (CCTs) and high color rendering indexes (CRIs) are highly desirable for energy-efficient environmentally friendly solid-state light sources. Here, we report a new efficient blue light-excited, green-emitting Ce3+-activated CaY2ZrScAl3O12 phosphor, which underpins the fabrication of high-color quality full-visible-spectrum warm-white LED devices ultrahigh CRI values (Ra > 96 R9 96). A family CaY2ZrScAl3O12:Ce3+ phosphors different Ce3+ dopant concentrations were prepared by high-temperature synthesis. X-ray diffraction corresponding Rietveld refinement reveal garnet structure an Ia3̅d space group crystallographic parameters = b c 12.39645(8) Å, α β γ 90°, V 1904.99(4) Å3. Luminescence properties studied in detail as function optimal concentration 1% mol. Impressively, CaY2ZrScAl3O12:1%Ce3+ exhibits broad excitation band from 370 to 500 nm, peaking at ∼421 is well matched emission commercial chips. Under 421 nm excitation, phosphor produces dazzling green wide 435 750 (emission peak: 514 nm; full width half-maximum: 113 nm), internal quantum efficiency 63.1% good resistance thermal quenching (activation energy 0.28 eV). device combining 450 chip CaAlSiN3:Eu2+ red converters demonstrates bright excellent CIE coordinates (0.3938, 0.3819), CCT 3696 K, 96.9, 98.2), luminous efficacy 45.04 lm W-1 under 20 mA driving current. New enable design implementation luminescent materials healthy lighting.