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Highly efficient adjustable photoluminescence with negative thermal expansion/quenching of SrGa2B2O7: Bi/Na/Tb/Eu for LEDs via synergistic alkali metal ions and Sr/O vacancies regulations
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DOI：10.1016/j.jre.2026.07.010.png)
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Abstract
En 中文
Phosphor with thermally stable and highly efficient photoluminescence (PL) is a premise/challenge for use in high-quality phosphor-converted light-emitting diodes (pc-LEDs). Herein, via a facile solid-phase sintering method in air, a negative thermal quenching (TQ) blue emitting SrGa2B2O7 (SGB): Bi is reported, mainly associating with the underlying collaborative effect of negative volumetric thermal expansion of rigid host, heterovalent substitution (Bi3+ → Sr2+)-induced VSr/VO vacancies, and generating self-reduction ions (Bi2+). For charge balance under the condition of temperature rising, both opposite process of self-oxidation (Bi2+ to Bi3+) and charge release from trap levels can compensate blue-PL loss. This phosphor is comparable to Eu2+/Ce3+-activated blue-emitting phosphors, and even boasts superior quantum efficiency (QE) and thermal stability. Via artificially codoping Na+ for charge compensation, the QE of the SGB:Bi/Na can be further significantly enhanced. Color-tunable PL is achieved via cascade-connected energy transfer (ET) from Bi3+ to Tb3+ (green)/Eu3+ (red) in SGB: Bi/Na/Tb/Eu that possesses high QE/stability than the case of blue/green/red tricolor phosphor blends adopted in warm white LEDs (wLEDs). Finally, the SGB: Bi/Na and SGB: Bi/Tb/Eu/Na are respectively, encapsulated with distinct encapsulants via either traditional or remote “capping” packaging strategy to form blue LEDs and wLEDs, showcasing splendid electroluminescence behaviors and luciferous application prospects.
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