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Zn1−xMgxSe:Ho3+ (x = 0.093, 0.123, 0.161, 0.235, 0.306, and 0.481), Zn1−xMgxSe:Er3+ (x =0.097, 0.122, 0.158, 0.232, 0.309, and 0.476), and Zn1−xMgxSe:Tm3+ (x = 0.098, 0.120, 0.160,0.234, 0.294, and 0.482) single crystals were grown by using the chemical transport reaction (CTR) method with BN(boron nitride) tubes. The Zn1−xMgxSe:Ho3+, the Zn1−xMgxSe:Er3+, and the Zn1−xMgxSe:Tm3+ single crystals showed a white emission. The dopants Ho3+, Er3+, and Tm3+in the single crystals play an important role to enhance the white emission. We identified the white photoluminescence emissions of the single crystals by measuring their color oordinates.